Question

Resolva as equações e obtenha a solução de cada uma,sabendo que U=R
a)3x-9=9
b)x-5=-7
c)y-6=5y+8
d)10x=20+9x
e)2x+5-x=5-3x
f)2m+6=m
g)2x+1=15
h)5-x-20=5x-10-7x
i)x-6=2-3x
j)2(x-7)-4.(5-x)=2

Answer 1

A)
3x-9 = 9
3x = 9+9
3x = 18
x = 18/3 => 6

B)
x-5 = -7
x = -7+5
x = -2

C)
y-6 = 5y+8
y-5y = 8+6
(-4y = 14) . (-1)
y = -14/4

D)
10x = 20+9x
10x-9x = 20
x = 20

E)
2x+5-x = 5-3x
x+3x = 5-5
2x = 0
x = 0/2 => 0

F)
2m+6 = m
2m-m = -6
m = -6

G)
2x+1 = 15
2x = 15-1
x = 14/2 => 7

H) 5-x-2 = 5x-10-7x
-x-5x+7x = -10-5+2
(-x = -13) . (-1)
x = 13

I)
x-6 = 2-3x
x+3x = 2+6
4x = 8
x = 8/4 => 2

J)
2(x-7)-4.(5-x) = 2
2x-14-20-4x = 2
-2x-34 = 2
(-2x = 2+34) . (-1)
2x = -2-34
x = -36/2
x = -18