$\log_{5x}\left(x^2-5x+11\right)-7=-5$

$\left(4x^4+7y^2\right)^2$

$\left(\frac{-7x}{4}y^2-\frac{6x^3}{5}y^4\right)\left(\frac{7x}{4}y^2-\frac{6x^3}{5}y^4\right)$

$\frac{3}{x}-\frac{1}{2}$

$\frac{3yx^2}{x^3y^3}$

$x\left(x+2\right)\le0$

$-\cos\left(x\right)-\sin\left(x\right)$