Question
$$2+1-3\cdot\frac{2}{7} = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 2+1-3\cdot\frac{2}{7} &= 0&& \text{multiply ALL terms by } \color{blue}{ 7 }. \\[1 em]7\cdot2+7\cdot1-7\cdot3\cdot\frac{2}{7} &= 7\cdot0&& \text{cancel out the denominators} \\[1 em]14+7-6 &= 0&& \text{simplify left side} \\[1 em]15 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 15 = 0 } $ is FALSE, we conclude that the equation has no solution.
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