$a^2-18a$
$\left(x-16\right)\left(x\:+\:8\right)$
$\frac{3x^4+19x^3+22x^2-6x+4}{x+2}$
$5m+2n+4m+9n$
$6x^2+6x+2-\left(2x-1\right)^2$
$x^2-8x<-15$
$\left(5\left(3x-y\right)+4\right)\left(5\left(3x-y\right)-4\right)$
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