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\frac{4\left(-a+b\right)}{4}-\frac{-a-3b}{4}
To add or subtract expressions, expand them to make their denominators the same. Multiply -a+b times \frac{4}{4}.
\frac{4\left(-a+b\right)-\left(-a-3b\right)}{4}
Since \frac{4\left(-a+b\right)}{4} and \frac{-a-3b}{4} have the same denominator, subtract them by subtracting their numerators.
\frac{-4a+4b+a+3b}{4}
Do the multiplications in 4\left(-a+b\right)-\left(-a-3b\right).
\frac{-3a+7b}{4}
Combine like terms in -4a+4b+a+3b.
\frac{4\left(-a+b\right)}{4}-\frac{-a-3b}{4}
To add or subtract expressions, expand them to make their denominators the same. Multiply -a+b times \frac{4}{4}.
\frac{4\left(-a+b\right)-\left(-a-3b\right)}{4}
Since \frac{4\left(-a+b\right)}{4} and \frac{-a-3b}{4} have the same denominator, subtract them by subtracting their numerators.
\frac{-4a+4b+a+3b}{4}
Do the multiplications in 4\left(-a+b\right)-\left(-a-3b\right).
\frac{-3a+7b}{4}
Combine like terms in -4a+4b+a+3b.