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2a(3a-2)-5(4+3a)=
6-4a-20-15a=
6-19a-20
B)
-3a(2-5b)+b(4+a)=
-6a-15ab+4b+ab=
-6a+4b-14ab
C)
3b(2a-b)-3b(2b-3a)=
6ab-3-6-9ab=
-3ab-9
D)
-(a+2b)-(b-2a)=
-a-2b-b+2a=
a-3b