Question

Encontre a solução das equação abaixo:
a_ 3x+5=8
b_ 10x-19=21
c_2x-7=_10
d_0,5x+2,6=5,1
e_ 5x-27=-4x
f_9x+5=4x
g_60+13x=3×
h_4x-12=x
i_5x+21=10x-19
j_ 11x+17=10x+13
3+1,6x=0,1x​

Answer 1

a) 3x + 5 = 8

8 - 5 = 3x

3 = 3x

x = $\frac{3}{3}$

x = 1

b) 10x - 19 = 21

21 + 19 = 10x

30 = 10x

x = $\frac{30}{10}$

x = 3

c) 2x - 7 = 10

10 + 7 = 2x

17 = 2x

x = $\frac{17}{2}$

x = 8,5

d) 0,5x + 2,6 = 5,1

5,1 - 2,6 = 0,5x

2,5 = 0,5x

x = $\frac{25}{5}$

x = 5

e) 5x - 27 = -4x

-27 = -4x - 5x

-27 = -9x

x = $\frac{-27}{-9}$

x = 3

f) 9x + 5 = 4x

5 = 4x - 9x

5 = -5x

x = $\frac{5}{-5}$

x = - 1

g) 60 + 13x = 3x

60 = 3x - 13x

60 = -10x

x = $\frac{60}{-10}$

x = -6

h) 4x - 12 = x

-12 = x - 4x

-12 = -3x

x = $\frac{-12}{-3}$

x = 4

i) 5x + 21 = 10x - 19

21 + 19 = 10x + 5x

40 = 15x

x = $\frac{40 }{15}$

x = 2.66666666667

j) 11x + 17 = 10x + 13

17 - 13 = 10x - 11x

4 = -1x

x = $\frac{4}{-1}$

x = -4

k) 3 + 1,6x = 0,1x​

3 = 0,1x - 1,6x

3 = -1,5x

x = $\frac{30}{15}$

x = 2