$-7\cdot9+4\cdot10$
$\frac{d}{dx}\sqrt{x}+\sqrt{y}=1$
$dy=\frac{\left(e^{x-y}\right)}{2}.dx$
$\int\:\frac{3}{x^2-4x+3}dx$
$\left(121x^2-144m^2\right)$
$63-\left(-2\right)$
$\left(2ab+3a^2b\right)+\left(-11ab-3a^2b\right)$
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