$$ \begin{aligned} 3-2(x+4) &= -3(4x-5)&& \text{simplify left and right hand side} \\[1 em]3-(2x+8) &= -(12x-15)&& \\[1 em]3-2x-8 &= -12x+15&& \\[1 em]-2x-5 &= -12x+15&& \text{move the $ \color{blue}{ -12x } $ to the left side and $ \color{blue}{ -5 }$ to the right} \\[1 em]-2x+12x &= 15+5&& \text{simplify left and right hand side} \\[1 em]10x &= 20&& \text{ divide both sides by $ 10 $ } \\[1 em]x &= \frac{20}{10}&& \\[1 em]x &= 2&& \\[1 em] \end{aligned} $$

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