$$-\frac{b}{6}-50 = -49$$

$$ \begin{aligned} -\frac{b}{6}-50 &= -49&& \text{multiply ALL terms by } \color{blue}{ 6 }. \\[1 em]-6 \cdot \frac{b}{6}-6\cdot50 &= 6\cdot(-49)&& \text{cancel out the denominators} \\[1 em]-b-300 &= -294&& \text{ move -300 to the right } \\[1 em]-b &= -294+300&& \\[1 em]-b &= 6&& \text{switch signs on both sides} \\[1 em]b &= -6&& \\[1 em] \end{aligned} $$

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