SOLUTION: 50(3A-B) - 20(B-2A)

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Question 161949: 50(3A-B) - 20(B-2A)
Answer by jim_thompson5910(35256) About Me  (Show Source):
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50(3A-B) - 20(B-2A) = 50(3A)-50(B) - 20(B)-(-20)(2A)
                    = 150A - 50B - 20B + 40A
                    = 190A - 70B