$$3x+5 = 5x+25$$
Answer
$$ x = -10 $$
Explanation
$$ \begin{aligned} 3x+5 &= 5x+25&& \text{move the $ \color{blue}{ 5x } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]3x-5x &= 25-5&& \text{simplify left and right hand side} \\[1 em]-2x &= 20&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= -\frac{20}{2}&& \\[1 em]x &= -10&& \\[1 em] \end{aligned} $$
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