Question
$$7b-15 = 5b-3$$
Answer
$$ b = 6 $$
Explanation
$$ \begin{aligned} 7b-15 &= 5b-3&& \text{move the $ \color{blue}{ 5b } $ to the left side and $ \color{blue}{ -15 }$ to the right} \\[1 em]7b-5b &= -3+15&& \text{simplify left and right hand side} \\[1 em]2b &= 12&& \text{ divide both sides by $ 2 $ } \\[1 em]b &= \frac{12}{2}&& \\[1 em]b &= 6&& \\[1 em] \end{aligned} $$
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