Question

2. Calcule:
A. 2x - 4 = 3 - 6x
B.2x+10=20
C.10-5x=25​

Answer 1

Explicação:

$a) \: \: 2x - 4 = 3 - 6x \\ 2x + 6x = 3 + 4\\ 8x = 7 \\ x = \frac{7}{8}$

$b) \: \: 2x + 10 = 20 \\ 2x = 20 - 10 \\ 2x = 10 \\ x = \frac{10}{2} \\ x = 5$

$c) \: \: 10 - 5x = 25 \\ - 5x = 25 - 10 \\ - 5x = 15 \\ x = \frac{15}{ - 5} \\ x = - 3$