$a^2+ab+7a^2+8ab-3ab-6a^2+11a^2$
$x^2y^2+xy-y=0$
$6x+1+10$
$\left(2\:+\:n\right)^2$
$\frac{dy}{dx}+\frac{2}{x}+x^2=sen2x$
$10p^2q^3+14p^3q^2-18p^4$
$+36m^2n^4-9x^6$
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