$25y-17y-6xy-3xy$
$m^3-3m^2+3m-1$
$\frac{1}{2}ab^3c-\frac{3}{2}ab^3-ab^3c$
$5x\:-\:10\:=\:70$
$\left(2x^a+4x^{a+1}\right)^2$
$s^2-2sn+n^2$
$3x^3\:3$
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