$$ \begin{aligned} 6q+8 &= -10+4q&& \text{move the $ \color{blue}{ 4q } $ to the left side and $ \color{blue}{ 8 }$ to the right} \\[1 em]6q-4q &= -10-8&& \text{simplify left and right hand side} \\[1 em]2q &= -18&& \text{ divide both sides by $ 2 $ } \\[1 em]q &= -\frac{18}{2}&& \\[1 em]q &= -9&& \\[1 em] \end{aligned} $$
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