To expand \(-\frac{5}{6}(9b - 12)\), we can distribute \(-\frac{5}{6}\) to both terms inside the parentheses:
\[ -\frac{5}{6} \cdot 9b + -\frac{5}{6} \cdot (-12) \]
Calculating each term:
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For \(-\frac{5}{6} \cdot 9b\): \[ -\frac{5 \cdot 9b}{6} = -\frac{45b}{6} = -\frac{15b}{2} \quad (\text{by simplifying } -\frac{45}{6}) \]
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For \(-\frac{5}{6} \cdot (-12)\): \[ -\frac{5 \cdot -12}{6} = \frac{60}{6} = 10 \]
Now, combine these results:
\[ -\frac{15b}{2} + 10 \]
So, the expanded form of \(-\frac{5}{6}(9b - 12)\) is:
\[ -\frac{15b}{2} + 10 \]