Question

2x=8
5x=30
3x=1
2x+5=13

Answer 1

$2x=8\\ \frac{2x}{2}=\frac{8}{2}\\ x=4\\ 5x=30\\ \frac{5x}{5}=\frac{30}{5}\\ x=6\\ 3x=1\\ \frac{3x}{3}=\frac{1}{3}\\ x=\frac{1}{3}\\ 2x+5=13\\ 2x+5-5=13-5\\ 2x=8\\ \frac{2x}{2}=\frac{8}{2}\\ x=4$

Answer 2

Vamos aos cálculos :
2x = 8
x= 8/2
x=4

5x=30
x=30/5
x=6

3x=1
x=1/3

2x+5=13
2x=13-5
2x=8
x=8/2
x=4