$$ \begin{aligned} 4 &= -10b+6\cdot(2-b)&& \text{simplify right side} \\[1 em]4 &= -10b+12-6b&& \\[1 em]4 &= -16b+12&& \text{ swap the left and right side of the equation } \\[1 em]-16b+12 &= 4&& \text{ move 12 to the right } \\[1 em]-16b &= 4-12&& \\[1 em]-16b &= -8&& \text{ divide both sides by $ -16 $ } \\[1 em]b &= \frac{-8}{-16}&& \\[1 em]b &= \frac{1}{2}&& \\[1 em] \end{aligned} $$

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