$-7y+-6y+-y$
$\frac{x^4+18x^2+81}{x+1}$
$x^4+16x^2+16$
$31x^2+62x=0$
$\int x^8\left(x^9+3\right)^7\:dx$
$x^3-5x^2-22x+56$
$\frac{a^2+2ab+b^2}{a+b}$
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