$$ \begin{aligned} x\cdot2+5x+1 &= 5x+2&& \text{simplify left side} \\[1 em]x\cdot2+5x+1 &= 5x+2&& \\[1 em]7x+1 &= 5x+2&& \text{move the $ \color{blue}{ 5x } $ to the left side and $ \color{blue}{ 1 }$ to the right} \\[1 em]7x-5x &= 2-1&& \text{simplify left and right hand side} \\[1 em]2x &= 1&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{1}{2}&& \\[1 em] \end{aligned} $$

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