Question

Can someone explain how to solve this please?

Answer 1

$a = \frac{2x + 6}{5} \\ 5a = 2x + 6 \\ 5a - 6 = 2x \\ x = \frac{5a - 6}{ 2}$

Answer 2

Start with

$a = \dfrac{2x+6}{5}$

Multiply both sides by 5:

$5a = 2x+6$

Subtract 6 from both sides:

$5a-6 = 2x$

Divide both sides by 2:

$\dfrac{5a-6}{2} = x$