$0.35\left(x-0.6\right)=0.2\left(x+1.2\right)$

$72\:\left(20+20-1\right)$

$y^2+x^2y=0$

$\left(h^{\left(6\right)}tb^{\left(3\right)}\right)^{\left(5\right)}$

$20x^2+50x-70$

$\lim_{x\to\infty}\left(xsin\left(\frac{4}{x}\right)\right)$

$\int\:\frac{2x-1}{x\left(x^2+1\right)}dx$