$$ \begin{aligned} 7x+11-3x &= 31-6x&& \text{simplify left and right hand side} \\[1 em]4x+11 &= -6x+31&& \text{move the $ \color{blue}{ -6x } $ to the left side and $ \color{blue}{ 11 }$ to the right} \\[1 em]4x+6x &= 31-11&& \text{simplify left and right hand side} \\[1 em]10x &= 20&& \text{ divide both sides by $ 10 $ } \\[1 em]x &= \frac{20}{10}&& \\[1 em]x &= 2&& \\[1 em] \end{aligned} $$

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