$7m^4+21m^3n+42m^2n^3$
$8x-8=-4x+16$
$\frac{df}{dx}=\left(3-x\right)e^{f-x}$
$7-1-x-5y+4y-6$
$-5\cdot\left(-2\right)\cdot4\cdot\left(-10\right)$
$\frac{30\sqrt{x}}{x^3}$
$\left(8a^3+4a^2b+2ab^2+b^3\right).\left(2a-b\right)$
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