$$ \begin{aligned} 23(3x-4)-56 &= 12(6x+2)&& \text{simplify left and right hand side} \\[1 em]69x-92-56 &= 72x+24&& \\[1 em]69x-148 &= 72x+24&& \text{move the $ \color{blue}{ 72x } $ to the left side and $ \color{blue}{ -148 }$ to the right} \\[1 em]69x-72x &= 24+148&& \text{simplify left and right hand side} \\[1 em]-3x &= 172&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= -\frac{172}{3}&& \\[1 em] \end{aligned} $$

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