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\frac{1}{4}a=-\frac{1}{10}-\frac{11}{15}
Subtract \frac{11}{15} from both sides.
\frac{1}{4}a=-\frac{3}{30}-\frac{22}{30}
Least common multiple of 10 and 15 is 30. Convert -\frac{1}{10} and \frac{11}{15} to fractions with denominator 30.
\frac{1}{4}a=\frac{-3-22}{30}
Since -\frac{3}{30} and \frac{22}{30} have the same denominator, subtract them by subtracting their numerators.
\frac{1}{4}a=\frac{-25}{30}
Subtract 22 from -3 to get -25.
\frac{1}{4}a=-\frac{5}{6}
Reduce the fraction \frac{-25}{30} to lowest terms by extracting and canceling out 5.
a=-\frac{5}{6}\times 4
Multiply both sides by 4, the reciprocal of \frac{1}{4}.
a=\frac{-5\times 4}{6}
Express -\frac{5}{6}\times 4 as a single fraction.
a=\frac{-20}{6}
Multiply -5 and 4 to get -20.
a=-\frac{10}{3}
Reduce the fraction \frac{-20}{6} to lowest terms by extracting and canceling out 2.