-(3c-2)(c-1)-c(c-2)=
(m+n)(m-n)+(m-n)(m+1)=
-3c +3c -2c +2 - c+2c= -4c +3c +2
m- mn + nm - + m +m - nm -n = 2m -nm +m -n - n
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-3c +3c -2c +2 - c+2c= -4c +3c +2
m- mn + nm - + m +m - nm -n = 2m -nm +m -n - n