$y=xy+y$

$\left(7m^2-5mn+6n^2\right)-\left(5m^2-8mn-n^2\right)$

$\frac{9-x^2}{3+x}$

$98.25\cdot90.75$

$\cos\:^2\left(x\right)=\sin^2\left(x\right)\cdot\cos\:^2\left(x\right)+\cos\:^4\left(x\right)$

$3x-8<2x-7$

$125-\left(-46\right)+\left(97\right)-\left(-201\right)$