Question

Alguém pode me ajudar?

Answer 1

Resposta:

1) x = 75

2) a) x = 6

b) x = -(5/2)

c) x = 3

d) x = -4

e) x = 30

Explicação passo a passo:

1) 112+7x-262=5x

$7x-5x = 262-112\\2x = 150\\x = 75$

2) a) 10x-38=22

$10x = 22+38\\10x = 60\\x = 6$

b) 2x-5=-10

$2x = -10 + 5\\x = \frac{-5}{2} = -\frac{5}{2}$

c) 5x -27 = -4x

$5x+4x = 27\\9x = 27\\x = 3$

d) 11x + 17 = 10x + 13

$11x -10x = 13-17\\x = -4$

e) x/5 = 21 - x/2

$10\times \frac{x}{5} = 10 \times 21 - 10\times\frac{x}{2}\\2x = 210 -5x\\2x+5x = 210\\7x = 210\\x = \frac{210}{7} = 30$