$$ \begin{aligned} 3x+15+3x+15 &= 10x-25&& \text{simplify left side} \\[1 em]6x+30 &= 10x-25&& \text{move the $ \color{blue}{ 10x } $ to the left side and $ \color{blue}{ 30 }$ to the right} \\[1 em]6x-10x &= -25-30&& \text{simplify left and right hand side} \\[1 em]-4x &= -55&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= \frac{-55}{-4}&& \\[1 em]x &= \frac{55}{4}&& \\[1 em] \end{aligned} $$

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