$$ \begin{aligned} 3x-5 &= -x+3&& \text{move the $ \color{blue}{ -x } $ to the left side and $ \color{blue}{ -5 }$ to the right} \\[1 em]3x+x &= 3+5&& \text{simplify left and right hand side} \\[1 em]4x &= 8&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{8}{4}&& \\[1 em]x &= 2&& \\[1 em] \end{aligned} $$
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