$\left(-28\right)\::\:\left(-7\right)\:es$
$\left(5x^2+2^2\right)$
$\frac{dx}{dz}=e^x\sin\left(z\right)$
$\int\left(\frac{e^x+e^{2x}}{\sqrt{1-e^{2x}}}\right)dx$
$0-\left(-25\right)\:+8-\left(-6\right)$
$2x^2-2xy-4y^2$
$\frac{6x-3}{x+2}\le5$
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