$x-y+3\cdot x\cdot y=2$
$y'+2xy=0\:,\:y\left(0\right)=3$
$3a-2b-5b+9a+10$
$\left(-1\right)^2\cdot\left(-1\right)^7$
$25a^2\:-\:100\:$
$\left(y^2+3y-4\right)\left(y^2+2y\right)$
$\frac{t^3u^{-1}v^{-1}w^4}{t^5u^{-1}v^0w.t^{-1}u^{-1}vw^0}$
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