$3\cdot\left(-2+5\right)-\left(4-5\cdot2\right)$
$5x^2-11x+4$
$4x^2+17x-15=0$
$\frac{d^2u}{xy}+u=0$
$-2+12x^3-18x^6$
$3\cdot17$
$\left(7xy+2m^2\right)^3$
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