$250-\left(6-4+5\right)-8-\left(9-5+3\right)$

$\int3x^2\left(x-2x^2\right)dx$

$-3x+2x-6+5-2y+4y$

$\sqrt[5]{96y^{10}}z^{11}$

$\int\frac{3x^2+2}{\left(5-2x\right)^2\left(x^2+10x+26\right)}dx$

$\lim_{x\to0}\left(\frac{e^{7x}-e^{4x}}{\sin\left(7x\right)-\sin\left(4x\right)}\right)$

$8.\:\left(-7\right)-15$