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0=\frac{4}{5}\left(x-\left(-3\right)\right)
Subtract 4 from 4 to get 0.
0=\frac{4}{5}\left(x+3\right)
The opposite of -3 is 3.
0=\frac{4}{5}x+\frac{4}{5}\times 3
Use the distributive property to multiply \frac{4}{5} by x+3.
0=\frac{4}{5}x+\frac{4\times 3}{5}
Express \frac{4}{5}\times 3 as a single fraction.
0=\frac{4}{5}x+\frac{12}{5}
Multiply 4 and 3 to get 12.
\frac{4}{5}x+\frac{12}{5}=0
Swap sides so that all variable terms are on the left hand side.
\frac{4}{5}x=-\frac{12}{5}
Subtract \frac{12}{5} from both sides. Anything subtracted from zero gives its negation.
x=-\frac{12}{5}\times \frac{5}{4}
Multiply both sides by \frac{5}{4}, the reciprocal of \frac{4}{5}.
x=\frac{-12\times 5}{5\times 4}
Multiply -\frac{12}{5} times \frac{5}{4} by multiplying numerator times numerator and denominator times denominator.
x=\frac{-12}{4}
Cancel out 5 in both numerator and denominator.
x=-3
Divide -12 by 4 to get -3.