Question
$$9x-3x+4 = 2(3x+4)$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 9x-3x+4 &= 2(3x+4)&& \text{simplify left and right hand side} \\[1 em]6x+4 &= 6x+8&& \text{move the $ \color{blue}{ 6x } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]6x-6x &= 8-4&& \text{simplify left and right hand side} \\[1 em]6x-6x &= 4&& \\[1 em]0 &= 4&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 0 = 4 } $ is FALSE, we conclude that the equation has no solution.
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