$5x-7\le-13$

$-29+\left(5-\left(15+7\cdot\left(3-6\right)+\left(3-5\right)\right)\right)$

$230.000-124.200+250.000-158.900$

$x^24x+6$

$\frac{d^2}{dy^2}\left(3x^2y-2x^2y^2+y^2\right)$

$-272-7$

$\frac{d}{dx}\left(\frac{\left(7x^5cosx\right)}{\left(x-1\right)^{\frac{2}{3}}e^{x+1}}\right)$