$\:\left(3mx\right)^2$

$2x^2+x+1=x^2-3x-3$

$\int\frac{\left(3x+2\right)}{\left(x^2-4\right)}dx$

$\frac{3}{4}x+5=11$

$6x+8y=28$

$y'=-\frac{sin\left(2x\right)arctan\left(sin\left(x\right)\right)}{sin\left(y\right)cos\left(y\right)}.\left(sin^4\left(y\right)+cos^4\left(y\right)\right)$

$21a^3-4a^2+20\:\:\:-\:\:\:12a^3+4a^2-20$