Question

Determine a raiz de cada equação;

A) 5 + x = -7 + 8x

B) 7× + 1 = 5× - 7

C) 5× - 91 = 4× - 77

Answer 1

Vamos lá!

A) 5 + x = - 7 + 8x
x - 8x = -7 - 5
- 7x = - 12 (-1)
7x = 12
x = 12/7

B) 7x + 1 = 5x - 7
7x - 5x = - 7 - 1
2x = - 8
x = - 8/2
x = - 4

C)5x - 91 = 4x - 77
5x - 4x = - 77 + 91
x = 14