$=\left(+7\right)\left(+5\right)\left(-3\right)$

$2x^2+9x=x-14$

$5y^2+7x^3-y^2-2x^3$

$\int\frac{x^2}{\left(5x+7\right)^3}dx$

$\int_{\frac{\pi}{6}}^{\frac{\pi}{3}}\left(\frac{\sec^4\left(x\right)}{\tan^2\left(x\right)}\right)dx$

$-2xym-2xyn$

$\int-3x\cos\left(2x\right)dx$