$\frac{5x^2-6x+4}{x+1}$
$\left(-4x-3\right)+\left(11y-x\right)+\left(-7x+10\right)+\left(y+x\right)$
$\frac{3}{x+2}=\frac{5}{x-4}$
$\lim_{x\to1}\frac{1-x}{\left(cos^{\frac{\pi}{2}}\right)\left(sen^{\frac{\pi}{2}}\right)}$
$\left(u^2+1\right)\frac{dv}{du}\left(+4uv\right)=3u$
$3a^2-6a^2+9a$
$-x^2+x+24=0$
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