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= 6a²b - 15ab + 3a²b - ab
= 9a²b - 16ab
b. -(2a²b - 5ab) + 2(-3a²b + ab)
= -2a²b + 5ab - 6a²b + 2ab
= -8a²b + 7ab
c. -2(2a²b - 5ab) - 2(-3a²b + ab)
= -4a²b + 10ab + 6a²b - 2ab
= 2a²b + 8ab
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