$\left(7^a+b\right)^2$
$6-15+28-15+17-16-9+13$
$\int x^{-13}dx$
$6m^7n^2-12m^3n^6$
$x^2+2x+7=0$
$\left(4y^2+x^2-2xy\right)\left(x^4-16y^4-8xy+2x^3y\right)$
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