Question

 quantos sao 5x-7 =3x+15

Answer 1

5x - 7 = 3x + 15
5x - 3x = 15 + 7
2x = 22
x = 22/2
x = 11

S = { 11 }

Answer 2

Olá Thaires!

$5x - 7 = 3x + 15 \\ 5x - 3x = 15 + 7 \\ 2x = 22 \\ x = \frac{22}{2} \\ x = 11$

Prova real:

$5x - 7 = 3x + 15 \\ 5 . ( 11 ) - 7 = 3 . ( 11 ) + 15 \\ 55 - 7 = 33 + 15 \\ 48 = 48$


Tenha ótimos estudos !