$-7h\:+\:3h^2\:-\:4h\:-2$
$20x^2+50x-70$
$\left(+10\right)+\left(-8\right)+\left(+1\right)+\left(-6\right)+\left(-30\right)$
$\left(5^2\right)^4.5^2$
$3y+dy=e^{2x}dx$
$-98-56+-14$
$\left(-4a^2+5b\right)\left(4a^2+5b\right)$
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