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Question
$$3m+12 = -14+3m+26$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} 3m+12 &= -14+3m+26&& \text{simplify right side} \\[1 em]3m+12 &= 3m+12&& \text{move the $ \color{blue}{ 3m } $ to the left side and $ \color{blue}{ 12 }$ to the right} \\[1 em]3m-3m &= 12-12&& \text{simplify left and right hand side} \\[1 em]3m-3m &= 0&& \\[1 em]0 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{blue}{ 0 = 0 } $ is TRUE for any value of $ x $, we conclude that the equation has infinitely many solutions.
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