Question
$$10b+18 = 28\cdot0$$
Answer
$$ b = -\dfrac{9}{5} $$
Explanation
$$ \begin{aligned} 10b+18 &= 28\cdot0&& \text{move the $ \color{blue}{ 0 } $ to the left side and $ \color{blue}{ 18 }$ to the right} \\[1 em]10b+0 &= -18&& \text{ divide both sides by $ 10 $ } \\[1 em]b &= -\frac{18}{10}&& \\[1 em]b &= -\frac{9}{5}&& \\[1 em] \end{aligned} $$
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