$$7\cdot(2-x) = 2(x+7)$$

$$ \begin{aligned} 7\cdot(2-x) &= 2(x+7)&& \text{simplify left and right hand side} \\[1 em]14-7x &= 2x+14&& \\[1 em]-7x+14 &= 2x+14&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ 14 }$ to the right} \\[1 em]-7x-2x &= 14-14&& \text{simplify left and right hand side} \\[1 em]-9x &= 0&& \text{ divide both sides by $ -9 $ } \\[1 em]x &= \frac{0}{-9}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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