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\frac{1}{3}x-\frac{1}{5}x=\frac{4}{5}
Subtract \frac{1}{5}x from both sides.
\frac{2}{15}x=\frac{4}{5}
Combine \frac{1}{3}x and -\frac{1}{5}x to get \frac{2}{15}x.
x=\frac{4}{5}\times \frac{15}{2}
Multiply both sides by \frac{15}{2}, the reciprocal of \frac{2}{15}.
x=\frac{4\times 15}{5\times 2}
Multiply \frac{4}{5} times \frac{15}{2} by multiplying numerator times numerator and denominator times denominator.
x=\frac{60}{10}
Do the multiplications in the fraction \frac{4\times 15}{5\times 2}.
x=6
Divide 60 by 10 to get 6.