Question

$2(10x - 2) = 18$

Answer 1

$2(10x - 2) = 18 \\ 20x - 4 = 18 \\ 20x = 18 + 4 \\ x = \frac{22}{20} \\ x = 1.1$
Sendo x = 1,1 vamos conferir:

$2(10(1.1) - 2) = 18 \\ 2(11 - 2) = 18 \\ 22 - 4 = 18 \\ 18 = 18$

Answer 2

$2(10x-2)=18\\20x-4=18\\20x=18+4\\20x=22\\x=\frac{22}{20} \\x=\frac{22}{20}/2 = \frac{11}{10}$