$4\:-\:\left(x\:-\:2\right)\:\ge\:2x$
$\frac{d}{dy}y=x^5-3x^4+2x^{-3}+9$
$\left(3y^2+2\right)+\left(6y^2-5y-4\right)$
$-\left(2-2^3\right)^2+5\cdot\left(-2\right)$
$2x^2-6x+10$
$x^3\ge16$
$20a^2+23a-7$
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