-(5a+b)-3(2a-3b)=

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-(5a+b)-3(2a-3b)=-(5a+b)-3(2a-3b)=-(5a+b)-3(2a-3b)=-(5a+b)-3(2a-3b)=-5a-b-6a+9b=-11a+8b-5a-b-6a+9b=-

-(5a+b)-3(2a-3b)=
-(5a+b)-3(2a-3b)=

-(5a+b)-3(2a-3b)=
-(5a+b)-3(2a-3b)
=-5a-b-6a+9b
=-11a+8b

-5a-b-6a+9b=-11a+8b