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\frac{1}{3}-\left(\frac{1}{3}-\left(\frac{1}{3}-\frac{1}{3}-\left(-2x\right)\right)\right)=21
To find the opposite of \frac{1}{3}-2x, find the opposite of each term.
\frac{1}{3}-\left(\frac{1}{3}-\left(\frac{1}{3}-\frac{1}{3}+2x\right)\right)=21
The opposite of -2x is 2x.
\frac{1}{3}-\left(\frac{1}{3}-2x\right)=21
Subtract \frac{1}{3} from \frac{1}{3} to get 0.
\frac{1}{3}-\frac{1}{3}-\left(-2x\right)=21
To find the opposite of \frac{1}{3}-2x, find the opposite of each term.
\frac{1}{3}-\frac{1}{3}+2x=21
The opposite of -2x is 2x.
2x=21
Subtract \frac{1}{3} from \frac{1}{3} to get 0.
x=\frac{21}{2}
Divide both sides by 2.