Question
$$6\cdot2\cdot(2+x) = 9$$
Answer
$$ x = -\dfrac{5}{4} $$
Explanation
$$ \begin{aligned} 6\cdot2\cdot(2+x) &= 9&& \text{simplify left side} \\[1 em]6\cdot(4+2x) &= 9&& \\[1 em]24+12x &= 9&& \\[1 em]12x+24 &= 9&& \text{ move 24 to the right } \\[1 em]12x &= 9-24&& \\[1 em]12x &= -15&& \text{ divide both sides by $ 12 $ } \\[1 em]x &= -\frac{15}{12}&& \\[1 em]x &= -\frac{5}{4}&& \\[1 em] \end{aligned} $$
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