Answers

  • Brainly User
2016-04-15T16:15:10+08:00
-(a-b) - 3(b-a)

=  -a + b -3b + 3a     (Distributive)

= -a + 3a + b - 3b     (Combine the like terms)

= 2a - 2b     

ANSWER:  2a - 2b
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