Question

C) X+5=20-4x X
d) 9x-4x+10=7X-30​

Answer 1

Resposta:

C)

$x + 5 = 20 - 4x + x \\ x + 4x- x = 20 - 5 \\ 4x = 16 \\ x = \frac{16}{4} \\ x = 4$

D)

$9x - 4x + 10 = 7x - 30 \\ 9x - 4x - 7x = - 30 - 10 \\ - 2x = - 40 \: \: \: .( - 1) \\ 2x = 40 \\ x = \frac{40}{2} \\ x = 20$

Gabarito:

C) x = 4

D) x = 20

Answer 2

C) X+5=20-4x
X+4x = 20-5
5x = 15
X = 15/5
x = 3
__________

d) 9x-4x+10=7X-30​
5x + 10 = 7x - 30
10+30= 7x - 5x
40 = 2x
2x = 40
x = 40/2
x = 20