$10a+3a-4a+6a-a$
$\int\frac{x}{\sqrt{x^2-10x+21}}dx$
$\sqrt{5x}$
$\frac{3x^4-2x^2-5x+3}{x-3}$
$\lim_{x\to0}\left(\frac{x^2+2}{2-2\sin\left(x\right)}\right)^{\frac{2}{x}}$
$8m^2+12$
$\int\frac{8x^3+8x^2+12x+20}{x^4+4x^2}dx$
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