Question

Determine o valor de x nas equações do 1º grau: a) 7x – 2 + 4 = 10 + 5x
b) 5 . (2x – 4) = 7 . (x + 1) – 3 ​

Answer 1

Oie, tudo bom?

a)

$7x - 2 + 4 = 10 + 5x \\ 7x + 2 = 10 + 5x \\ 7x - 5x = 10 - 2 \\ 2x = 8 \\ x = \frac{8}{2} \\ \boxed{x = 4}$

b)

$5(2x - 4) = 7(x + 1) - 3 \\ 10x - 20 = 7x + 7 - 3 \\ 10x - 20 = 7x + 4 \\ 10x - 7x = 4 + 20 \\ 3x = 24 \\ x = \frac{24}{3} \\ \boxed{x = 8}$

Att. NLE Top Shotta