$$ \begin{aligned} 7x &= -4x-6(-x-5)&& \text{simplify right side} \\[1 em]7x &= -4x-(-6x-30)&& \\[1 em]7x &= -4x+6x+30&& \\[1 em]7x &= 2x+30&& \text{move the $ \color{blue}{ 2x } $ to the left side} \\[1 em]7x-2x &= 30&& \text{simplify left side} \\[1 em]5x &= 30&& \text{ divide both sides by $ 5 $ } \\[1 em]x &= \frac{30}{5}&& \\[1 em]x &= 6&& \\[1 em] \end{aligned} $$

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