Question

resolva as seguintes equaçoes do 1o grau
2x+5=12
8x-6=6x
9x=4+x
x+6=11
7x=5x-14
11x+3=7x
6x-11=5x-3
9x+17=8x+7
6x+9=4x+9
5x-5=8x+2
8x-5=-2x+1
12x-1=13x-8
11x+13=6x-1
15x+1 =20x-1
2x+5=13

Answer 1

a) 2x = 12 - 5
2x = 7
x = 7 sobre 2

b)8x - 6 = 6x
8x - 6x = 6
2x = 6
x = 3

c)9x = 4 + x
9x - x = 4
8x = 4
x = 2

d)x + 6 = 11
x = 11 - 6
x = 5

e)7x=5x-14
7x - 5x = 14
2x = 14
x = 7

f)11x+3=7x
11x - 7x = 3
4x = 3
x = 3 sobre 4

g)6x-11=5x-3
6x - 5x = 11 - 3
x = 8

h)9x+17=8x+7
9x - 8x = - 17 + 7
x = 10

i)6x+9=4x+9
6x - 4x = - 9 +9
2x = 0
x = 0

j)5x-5=8x+2
5x - 8x = 2 + 5
-3x = 7
x = 7 sobre - 3

k)8x-5=-2x+1
8x + 2x = 1 +5
10x = 6
x = 6 sobre 10, ou 3 quintos

l)12x-1=13x-8
12x  - 13x = -8 +1
-x = -7

m)11x+13=6x-1
11x - 6x = -1 - 13
5x = 14
x = 14 sobre 5

n)15x+1 =20x-1
15x - 20x =  -1 +1
5x = 0
x = 0

o)2x+5=13
2x = 13 - 5
2x = 8
x = 4

Espero ter ajudado

Answer 2

$\displaystyle 2x+5=12 \Rightarrow 2x=12-5 \Rightarrow 2x=7 \Rightarrow x= \frac{7}{2} \\ \\ 8x-6=6x \Rightarrow 8x-6x=6 \Rightarrow 2x=6 \Rightarrow x= \frac{6}{2} \Rightarrow x=3 \\ \\ 9x=4+x \Rightarrow 9x-x=4 \Rightarrow 8x=4 \Rightarrow x= \frac{4}{8} \Rightarrow x= \frac{1}{2} \\ \\ x+6=11 \Rightarrow x=11-6 \Rightarrow x=5 \\ \\ 7x=5x-14 \Rightarrow 7x-5x=-14 \Rightarrow 2x=-14 \Rightarrow x=- \frac{14}{2} \Rightarrow x=-7$

$\displaystyle 11x+3=7x \Rightarrow 11x-7x=-3 \Rightarrow 4x=-3 \Rightarrow x=- \frac{3}{4} \\ \\ 6x-11=5x-3 \Rightarrow 6x-5x=-3+11 \Rightarrow x=8 \\ \\9x+17=8x+7 \Rightarrow 9x-8x=7-17 \Rightarrow x=-10 \\ \\ 6x+9=4x+9 \Rightarrow 6x-4x=9-9 \Rightarrow 2x=0 \Rightarrow x=0 \\ \\ 5x-5=8x+2 \Rightarrow 5x-8x=2+5 \Rightarrow -3x=7 \Rightarrow x=- \frac{7}{3}$

$\displaystyle 8x-5=-2x+1 \Rightarrow 8x+2x=1+5 \Rightarrow 10x=6 \Rightarrow x= \frac{6}{10} \Rightarrow x= \frac{3}{5} \\ \\ 12x-1=13x-8 \Rightarrow 12x-13x=-8+1 \Rightarrow -x=-8 \Rightarrow x=8 \\ \\ 11x+13=6x-1 \Rightarrow 11x-6x=-1-13 \Rightarrow 5x=-14 \Rightarrow x=- \frac{14}{5} \\ \\ 15x+1=20x-1 \Rightarrow 15x-20x=-1-1 \Rightarrow -5x=-2 \Rightarrow x= \frac{2}{5} \\ \\ 2x+5=13 \Rightarrow 2x=13-5 \Rightarrow 2x=8 \Rightarrow x= \frac{8}{2} \Rightarrow x=4$