Question
$$18 = 3(t+3)$$
Answer
$$ t = 3 $$
Explanation
$$ \begin{aligned} 18 &= 3(t+3)&& \text{simplify right side} \\[1 em]18 &= 3t+9&& \text{ swap the left and right side of the equation } \\[1 em]3t+9 &= 18&& \text{ move 9 to the right } \\[1 em]3t &= 18-9&& \\[1 em]3t &= 9&& \text{ divide both sides by $ 3 $ } \\[1 em]t &= \frac{9}{3}&& \\[1 em]t &= 3&& \\[1 em] \end{aligned} $$
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