$\int\frac{2x+1}{\left(x+1\right)\left(x^2-5x-6\right)}dx$
$\frac{1m}{2}-2m$
$21xy+56xz-14xw+63$
$\frac{d^2+d}{3d}.\:\frac{6}{7d+7}$
$-3+6x-7^2$
$\int\frac{y^{2}+2y+1}{\left(x^{2}+1\right)^{2}}dx$
$-7s^2+2s+3$
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