Question
$$8x-7(7x+3) = 225$$
Answer
$$ x = -6 $$
Explanation
$$ \begin{aligned} 8x-7(7x+3) &= 225&& \text{simplify left side} \\[1 em]8x-(49x+21) &= 225&& \\[1 em]8x-49x-21 &= 225&& \\[1 em]-41x-21 &= 225&& \text{ move -21 to the right } \\[1 em]-41x &= 225+21&& \\[1 em]-41x &= 246&& \text{ divide both sides by $ -41 $ } \\[1 em]x &= -\frac{246}{41}&& \\[1 em]x &= -6&& \\[1 em] \end{aligned} $$
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