$144y^6k^4-49x^8$

$xy'-2y=x^2$

$\frac{1}{\left(1000-y\right)y}$

$+9-5+11-12+14$

$\int\frac{8t}{e^{2t}}dt$

$12+\left(4-\left(-15-\left(1+2\right)-10\right)\right)$

$\left(+35\right)-\left(-32\right)+\left(-16\right)-\left(-24\right)+\left(+28\right)-\left(-36\right)+\left(+17\right)-\left(+16\right)-\left(-20\right)+\left(-8\right)$