$x^4-6x^3+8x^2-7x+5\:por\:-3a^2x^3$
$4m^2-44m+121$
$\left(\frac{7x-2}{x^2-1}\right)-\left(\frac{5x}{x+1}\right)$
$dy+4x^3dy+12x^2\cdot y^4\cdot dx=0$
$\infty-15$
$\int\left(\frac{9x^4}{\sqrt{x}}\right)dx$
$m^2+14m+2401$
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