-\frac{5}{6}-\left(-\frac{5}{4}\right)
= -\frac{5}{6}+\frac{5}{4}
Here, LCM is 24.
\frac{-5\left(4\right)+5(6))}{24}=\frac{(-20+30)}{24}=\frac{10}{24}=\frac{5}{12}
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