$$ \begin{aligned} 8 &= 2+2x&& \text{ swap the left and right side of the equation } \\[1 em]2+2x &= 8&& \text{ move 2 to the right } \\[1 em]2x &= 8-2&& \\[1 em]2x &= 6&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{6}{2}&& \\[1 em]x &= 3&& \\[1 em] \end{aligned} $$