$\int\frac{5x^4-8x^3+9x+7}{x^7}dx$
$\left(2x+3y-8\right)\left(2x-3y+8\right)$
$\left(z^4+9y\right)^2$
$5a^2-ab-5ab-5b^2$
$\frac{2xy}{-4x^3y^2}$
$\frac{z^3}{z-1}$
$2.004\cdot1.2$
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