$250x^2-40$
$\left(x+12\right)\left(x+11\right)$
$\int3e^{7x}dx$
$\left(a\:x\:+\:x\:y\right)\left(a\:x\:-\:x\:y\right)$
$30k+70=20k+80$
$\int\left(2-t\right)^3dt$
$-157-242-276$
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