$\lim_{x\to1}\left(-x^3+7x^2-11x\right)$
$72m^7n^3+18m^3n^4$
$\left(a^2b+2b^2\right)^3$
$\left(5x^2+4xy\right)-3\left(x+xy\right)$
$x^2+8x-105=0$
$x^2-10x+21<0$
$3x^4\left(2xy^2+5x^7-9y\right)$
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