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\frac{\left(5-x\right)\times 4}{5}=x
Express \frac{5-x}{5}\times 4 as a single fraction.
\frac{20-4x}{5}=x
Use the distributive property to multiply 5-x by 4.
4-\frac{4}{5}x=x
Divide each term of 20-4x by 5 to get 4-\frac{4}{5}x.
4-\frac{4}{5}x-x=0
Subtract x from both sides.
4-\frac{9}{5}x=0
Combine -\frac{4}{5}x and -x to get -\frac{9}{5}x.
-\frac{9}{5}x=-4
Subtract 4 from both sides. Anything subtracted from zero gives its negation.
x=-4\left(-\frac{5}{9}\right)
Multiply both sides by -\frac{5}{9}, the reciprocal of -\frac{9}{5}.
x=\frac{-4\left(-5\right)}{9}
Express -4\left(-\frac{5}{9}\right) as a single fraction.
x=\frac{20}{9}
Multiply -4 and -5 to get 20.