$4m^5n^7-7m^5n^7$
$9x^3-5x^3$
$2x+1\cdot x-1$
$\left(3y\right)^6$
$140x^5y^4z^2-70x^4y^3z^2+105x^3y^2$
$x+86=47$
$21x^2+25x-4$
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