Question
$$\frac{9}{10}+\frac{3}{6} = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} \frac{9}{10}+\frac{3}{6} &= 0&& \text{multiply ALL terms by } \color{blue}{ 30 }. \\[1 em]30\cdot\frac{9}{10}+30\cdot\frac{3}{6} &= 30\cdot0&& \text{cancel out the denominators} \\[1 em]27+15 &= 0&& \text{simplify left side} \\[1 em]42 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 42 = 0 } $ is FALSE, we conclude that the equation has no solution.
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