$-50+-50$
$49m^6+70m^3a^4+25a^8$
$-5\:x-5$
$\frac{2x+1}{3x-1}\cdot\frac{6}{1}$
$\left(\frac{2}{3}x^3y^2-\frac{1}{7}ab^2\right)^3$
$\frac{a^3.\:p^5}{a\:.p^6}$
$\frac{x^2}{x^3-1}$
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