$\left(-2xy+3x-4y\right)\left(5y+2x-6y^2\right)$

$\frac{6\left(4a\:-\:4c\right)\:-\:6\left(6a\:-\:2b\right)+3\left(8b\:-\:4c\right)}{4}$

$\int\sqrt{\left(x+25\right)}dx$

$2\left(x-1\right)\ge x+3$

$6\left(2x+4\right)=4\left(3x+6\right)$

$\left(x^2-y-1=0\right)\left(x-y+5=0\right)$

$\left(2\right)-4x\left(cx+c^2\right)\left(2cx+2c^2\right)+8\left(cx+c^2\right)^2$