Factor
\frac{x\left(21-4x\right)}{3}
Evaluate
-\frac{4x^{2}}{3}+7x
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\frac{-4x^{2}+21x}{3}
Factor out \frac{1}{3}.
x\left(-4x+21\right)
Consider -4x^{2}+21x. Factor out x.
\frac{x\left(-4x+21\right)}{3}
Rewrite the complete factored expression.
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