SOLUTION: can you explain how you can do this pls a-b-2a+4b-a+2b

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Question 1037395: can you explain how you can do this pls a-b-2a+4b-a+2b
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
You mean SIMPLIFY the expression?

a-b-2a%2B4b-a%2B2b
a%2B%28-b%29%2B%28-2a%29%2B4b%2B%28-a%29%2B2b, the meaning of subtraction
a%2B%28-2a%29%2B%28-a%29%2B%28-b%29%2B4b%2B2b, commutative property for addition
-2a%2B5b