$$ \begin{aligned} 24 &= 4(x+3)-8x&& \text{simplify right side} \\[1 em]24 &= 4x+12-8x&& \\[1 em]24 &= -4x+12&& \text{ swap the left and right side of the equation } \\[1 em]-4x+12 &= 24&& \text{ move 12 to the right } \\[1 em]-4x &= 24-12&& \\[1 em]-4x &= 12&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= -\frac{12}{4}&& \\[1 em]x &= -3&& \\[1 em] \end{aligned} $$

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