$-\left(-6+8-8-9\right)+\left(-5+8-7-7+3\right)-8+3$

$9x^2+42x-49$

$101f-10f+75m+314$

$\left(2a^2-7\right)^3$

$\int\left(\frac{2x}{\left(x-1\right)\cdot\left(x^2+4\right)^2}\right)$

$\int xe^{2x+5}dx$

$\int\frac{2x}{\left(x-4\right)\left(x+2\right)\left(x+1\right)}dx$