$4x^2+95x+244=7x^2+143x+436$

$\left(\frac{3x^2-9x}{x+1}\right)\left(\frac{x+1}{x-3}\right)$

$3\left(x-2yz+y^{2}\right)-4\left(x^{2}-y^{2}-3yz\right)+x^{2}+y^{2}$

$x^2<-1$

$2x^2+3x-x^2-x$

$\left(a^{2x}-b^{-x}\right)\left(a^{2x}+b^{-x}\right)$

$\left(3x-4y\right)+\left(-5x+y\right)-\left(3x-6y\right)$