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

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

$\left(x+m\right)\left(x+y\right)$

$a^2b^3\cdot3a^2\cdot$

$\lim_{x\to0}\left(\frac{\ln\left(x+1\right)+3\cdot\sin\left(3x\right)+\sin\left(2x\right)}{x^2}\right)$

$12x+11^2$

$\frac{3}{4}x\frac{-2}{9}-1\frac{1}{2}+\frac{7}{8}:\frac{7}{3}$