$\left(2z-4\right)^2$
$4x^2-7x+7$
$\frac{\left(s+3\right)^2}{\left(s-1\right)\left(s-2\right)\left(s+4\right)}$
$\frac{x^7+x^3+140}{x-2}$
$\left(6k-8\right)\left(6k-5\right)$
$\int\left(x+4\right)^{14}dx$
$4ax^2+8a^2x+2a$
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