mark my ans bestplzz

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mark my ans bestplzz

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-5a²b+3ab²+11-7a²b+8ab²-18

=-12a²b+11ab²-7

=-12a²b+11ab²-7

Arrange the variables in order and then find the answer.

= -5a²b - 7a²b + 3ab² + 8ab² + 11 - 18

= -12a²b + 11ab² - 7