$x+3\cdot3x-2$
$y^2+4xy+4x^2$
$y''\:+2y'\:-15y=0$
$\left(x-5\right)\left(x^2+25\right)\left(x+5\right)+625$
$\left(z^2-12\right)\left(z^2+8\right)$
$\int\left(x^2\:+\:1\right)\:sen\:x\:dx$
$\frac{y}{2}+7+4+4+7$
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