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= 2a-5ab+3b-3a+3ab+1+a-3b=
= -2ab-1
(2) (a) -1/3(6a-9b+c^2)=
=-2a+3b-
(b)
(3) 3y(2y-3x)-2y(4x+2y-5)=
=6-9xy-8xy-4+10y=
2-17xy+10y