September 2018 2 19 Report

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-(2a-3b+5)+(4a-7b+3)-(-3a-2b-1)


(4a+2b-7)-(a-3b-4)-(2a-b-3)

-(-2a+5b-4)+(2a-3b-45)-(-3a-b+2)

(-5a+b-3)-(2a-3b+5)-(4a-b-8)


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