$\int\frac{2x^3+x^2-1}{x^2\left(x+1\right)^2}dx$
$25-140m^4+196m^8$
$9n-21$
$-7a^2-8a^2$
$80\cdot31$
$\left(x-4y\right)\left(x+2y\right)$
$-7^2-\sqrt{121}$
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