$\left(+23\right)\cdot\left(+51\right)$
$2x^2z+x^2-2y+4=-1$
$y'=e^{2x}+y-1$
$\frac{64a^6-729b^6}{2a+3b}$
$\int_0^{\infty}sen^2\:x\:dx$
$-16m-m$
$x^2+4x-20=0$
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