$$ \begin{aligned} 17x+27 &= 8x&& \text{move the $ \color{blue}{ 8x } $ to the left side and $ \color{blue}{ 27 }$ to the right} \\[1 em]17x-8x &= -27&& \text{simplify left side} \\[1 em]9x &= -27&& \text{ divide both sides by $ 9 $ } \\[1 em]x &= -\frac{27}{9}&& \\[1 em]x &= -3&& \\[1 em] \end{aligned} $$
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