$4x-10+x+10+5x-20+10x-30+2x+2x+x-50$
$\frac{dx}{dz}=\frac{8}{x}$
$4+7+2-7-3$
$16.8\cdot5.5$
$\int\left(\frac{3x}{\left(3x^2-2\right)^3}\right)dx$
$\frac{1}{sec^2x-1}$
$48\cdot3$
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