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4-2x\geq 0
Calculate -2 to the power of 2 and get 4.
-2x\geq -4
Subtract 4 from both sides. Anything subtracted from zero gives its negation.
x\leq \frac{-4}{-2}
Divide both sides by -2. Since -2 is negative, the inequality direction is changed.
x\leq 2
Divide -4 by -2 to get 2.