$4x^7y^4dx+2x^8y^3dy=0$

$\left(-5x\right)^{-2}$

$\lim\:_{x\to\:\:2}\left(\frac{x^3-8}{2-x}\right)$

$\int_1^{\frac{7}{3}}\pi\left(\left(9x-5-x^2\right)^2\right)dx$

$-3x>14$

$\lim_{x\to\infty}\left(1+\frac{3.6}{x}\right)^{1.5x}$

$7+\left|10-\left(5-\left(6+4\right)\right)\right|-\left|15+\left(4-3\right)+\left(18-2\right)\right|-29$