$4\cdot a\cdot b-3\cdot b\cdot c-15\cdot d,\:a=2,\:b=5,\:c=3,\:d\:=-1,f=0$
$13\cdot44$
$\left(9m-7n\right)\left(9m+7n\right)$
$-1720+-8930$
$-3649\:x\:-16\:+\:-34440\::\:-35\:+\:-\:264\:x\:-94\:+\:-1495\::\:-65$
$49x^2y^8\:-\:36z^4x^{16}$
$\frac{24a^6b^8c^{11}}{10a^2b^2c^5}$
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