3a2b-5a2b,10a2b-7a2b
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= 3a²b + ( -5a²b ) + 10a²b + (-7a²b)
= 3a²b - 5a²b + 10a²b - 7a²b
= 3a²b + 10a²b - 5a²b - 7a²b
= 13a²b - 12a²b
= a²b. (ans)
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a²b is the answer ............
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