Question
$$\frac{1}{3}+4 = 12$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} \frac{1}{3}+4 &= 12&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3\cdot\frac{1}{3}+3\cdot4 &= 3\cdot12&& \text{cancel out the denominators} \\[1 em]1+12 &= 36&& \text{simplify left side} \\[1 em]13 &= 36&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 13 = 36 } $ is FALSE, we conclude that the equation has no solution.
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