Question
$$18 = 63-10t$$
Answer
$$ t = \dfrac{9}{2} $$
Explanation
$$ \begin{aligned} 18 &= 63-10t&& \text{ swap the left and right side of the equation } \\[1 em]63-10t &= 18&& \text{ move 63 to the right } \\[1 em]-10t &= 18-63&& \\[1 em]-10t &= -45&& \text{ divide both sides by $ -10 $ } \\[1 em]t &= \frac{-45}{-10}&& \\[1 em]t &= \frac{9}{2}&& \\[1 em] \end{aligned} $$
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