$y'\cdot\:\left(1+e^y\right)=e^{x-y}$

$22+2.50x\le85$

$1+2-3+4-5-6$

$4-25x^2=0$

$\left(\frac{3}{7}a^2-\frac{2}{5}ab+\frac{3}{4}b^2\right)\cdot\:\left(\frac{5}{2}a-\frac{3}{4}b\right)$

$\frac{1}{3}\left(5\ln\left(x+7\right)+\ln\left(x\right)-\ln\left(x^2-2\right)\right)$

$-1.25\left(-8+12\right)+\:0.375\left(-\frac{8}{4}\right)$