$x\left(y^2+2y+1\right)-4\left(y^2+2y+1\right)$

$60\left(\infty\right)$

$y^4+8y^2+16y=0$

$6x^2\:-\:6x\:-\:120$

$\left(4x^2-7x-2\right).\left(\ln\left(y\right)\right)^2.z+9y^2$

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

$\log\left(\frac{x-3}{5}\right)=\log\left(2x+1\right)$