$\frac{a+1}{5a}-\frac{1}{a}=1$
$2x^3-7x^2+8x-3$
$\left(9w+7x\right)^2$
$5+\left(-2\right)-\left(-4\right)+15+\left(-2\right)-\left(-8\right)$
$w^2+14w-49$
$\int\frac{xy}{x^2+y^2}dx$
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