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3=-\frac{1}{3}-x+\frac{12}{3}
Convert 4 to fraction \frac{12}{3}.
3=\frac{-1+12}{3}-x
Since -\frac{1}{3} and \frac{12}{3} have the same denominator, add them by adding their numerators.
3=\frac{11}{3}-x
Add -1 and 12 to get 11.
\frac{11}{3}-x=3
Swap sides so that all variable terms are on the left hand side.
-x=3-\frac{11}{3}
Subtract \frac{11}{3} from both sides.
-x=\frac{9}{3}-\frac{11}{3}
Convert 3 to fraction \frac{9}{3}.
-x=\frac{9-11}{3}
Since \frac{9}{3} and \frac{11}{3} have the same denominator, subtract them by subtracting their numerators.
-x=-\frac{2}{3}
Subtract 11 from 9 to get -2.
x=\frac{2}{3}
Multiply both sides by -1.