$\ln\left(x\right)-\ln\left(6\right)=3$
$45^2-35^2$
$\frac{d}{dx}\frac{z+2}{z}$
$3y+1y$
$15\:cm\:5\:cm\:\sqrt{200}$
$x^2y+20xy^2-15xy$
$5x-1<6$
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