$x\:-\:7x$
$\lim_{x\to\infty}\left(x-e^x\right)^{\frac{2}{x}}$
$13-\left(-2\right)$
$x^2+16>0$
$x^3-27y^3$
$8sinx\:+20=24$
$2\ln\left(2x\right)=4-\ln\left(25\right)$
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