$\int\frac{e^{-.02x}}{1-e^{-.02x}}dx$
$\frac{5x}{x}$
$20-25+14\left(-3\right)$
$-\left(24-28\right)+\:\left[17-\:\left(-3+11\right)\right]$
$\left(1.6z^3x+2.1x^2\right)\left(1.6z^3x-2.1x^2\right)$
$3\cos\left(2x\right)+10\sin\left(x\right)=7$
$-7x<42$
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