$\frac{dy}{dx}=\frac{7-x}{y+11},\:y\left(-4\right)=-4$

$1.117a-0,35b-2.25a+4,141a$

$ab\cdot\sqrt{b}$

$32-\left|-5+3\left(-2\right)+\left(-3\right)\left(-5+8\right)\right|$

$\int\:3cot\left(x\right).\left(2cot\left(x\right)+5sen\left(x\right)\right)dx$

$-9y+5x-3a^2\left(9y-5x\right)$

$\lim_{x\to-\infty}-4x$