$91-[x\left(c-x\right)+xh-\left(x+x\right)]\left(x+x\right)$

$\left(-47\right).\left(-60\right)$

$2\left(2x+3\right)-10<\left(x-2\right)$

$\left(\frac{3}{x^2}\right)\left(x^3\right)$

$v^2+6v^2+6-7$

$\int\left(\frac{2}{3+e^{2x+1}}\right)dx$

$\int_{-\infty}^{-1}x^{-\frac{17}{7}}dx$