$$ \begin{aligned} 8(2x-16)+15 &= 6x-23&& \text{simplify left side} \\[1 em]16x-128+15 &= 6x-23&& \\[1 em]16x-113 &= 6x-23&& \text{move the $ \color{blue}{ 6x } $ to the left side and $ \color{blue}{ -113 }$ to the right} \\[1 em]16x-6x &= -23+113&& \text{simplify left and right hand side} \\[1 em]10x &= 90&& \text{ divide both sides by $ 10 $ } \\[1 em]x &= \frac{90}{10}&& \\[1 em]x &= 9&& \\[1 em] \end{aligned} $$

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