$-4-3x^2+15$
$5x-3\le2x+15$
$y=-x^2+5x-7$
$8\left(-4x+3\right)$
$\left(-23\right)\cdot\left(-5\right)+\left(-23\right)\cdot\left(+19\right)$
$7\cdot b=-210$
$\frac{dy}{dx}=x^n$
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