$$3(t\cdot1-t\cdot2) = t$$

$$ \begin{aligned} 3(t\cdot1-t\cdot2) &= t&& \text{simplify left side} \\[1 em]3\cdot-t &= t&& \\[1 em]-3t &= t&& \text{move the $ \color{blue}{ t } $ to the left side} \\[1 em]-3t-t &= 0&& \text{simplify left side} \\[1 em]-4t &= 0&& \text{ divide both sides by $ -4 $ } \\[1 em]t &= \frac{0}{-4}&& \\[1 em]t &= 0&& \\[1 em] \end{aligned} $$

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