Question
$$4\cdot(3+a) = 3\cdot100$$
Answer
$$ a = 72 $$
Explanation
$$ \begin{aligned} 4\cdot(3+a) &= 3\cdot100&& \text{simplify left and right hand side} \\[1 em]12+4a &= 300&& \\[1 em]4a+12 &= 300&& \text{ move 12 to the right } \\[1 em]4a &= 300-12&& \\[1 em]4a &= 288&& \text{ divide both sides by $ 4 $ } \\[1 em]a &= \frac{288}{4}&& \\[1 em]a &= 72&& \\[1 em] \end{aligned} $$
This page was created using
Equations Solver