Question

9) Determine o valor de x na equação
2 (x + 1) + 5 (x - 1) = 7​

Answer 1

Oie, Td Bom?!

2(x + 1) + 5(x - 1) = 7

2x + 2 + 5x - 5 = 7

7x - 3 = 7

7x = 7 + 3

7x = 10

x = 10/7

Att. Makaveli1996

Answer 2

Explicação passo-a-passo:

$2(x+1)+5(x-1)=7\\2x+2+5x-5=7\\7x=7-2+5\\7x=10\\x=\frac{10}{7}$