Question
$$7\cdot3+\frac{9}{3} = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 7\cdot3+\frac{9}{3} &= 0&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3\cdot7\cdot3+3\cdot\frac{9}{3} &= 3\cdot0&& \text{cancel out the denominators} \\[1 em]63+9 &= 0&& \text{simplify left side} \\[1 em]72 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 72 = 0 } $ is FALSE, we conclude that the equation has no solution.
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