$4x^2-16x+7$
$\left(25+4x^2\right)\left(25-4x^2\right)$
$9m^2-36m+36$
$11x\left(5y+4z-7w\right)$
$-2x+3<-10x-5$
$6x^4+0x^3+0x^2+x-1$
$\left(9ab^2+8x^3y^4\right)^2$
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