$8a^2-16a-90$
$y^6-81\frac{y^6-81}{y^3-9}$
$\frac{x^4-x^3+x^2-3x-6}{x-1}$
$\frac{64n^3-125m^3x^6}{4n-5mx^2}$
$4-3.01$
$ab-3bc-2a+bc$
$2.8\cdot5$
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