Question
$$3(3x+4) = 9x$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 3(3x+4) &= 9x&& \text{simplify left side} \\[1 em]9x+12 &= 9x&& \text{move the $ \color{blue}{ 9x } $ to the left side and $ \color{blue}{ 12 }$ to the right} \\[1 em]9x-9x &= -12&& \text{simplify left side} \\[1 em]9x-9x &= -12&& \\[1 em]0 &= -12&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 0 = -12 } $ is FALSE, we conclude that the equation has no solution.
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