$$ \begin{aligned} 6(b+3) &= 2b+10&& \text{simplify left side} \\[1 em]6b+18 &= 2b+10&& \text{move the $ \color{blue}{ 2b } $ to the left side and $ \color{blue}{ 18 }$ to the right} \\[1 em]6b-2b &= 10-18&& \text{simplify left and right hand side} \\[1 em]4b &= -8&& \text{ divide both sides by $ 4 $ } \\[1 em]b &= -\frac{8}{4}&& \\[1 em]b &= -2&& \\[1 em] \end{aligned} $$

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