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7 (a - 2ab + 2) - 8a + (-15) + 11ab

First you want the remove the parentheses from he equation:

7 (a - 2ab + 2) - 8a + (-15) + 11ab

7a - 14ab + 14 - 8a - 15 + 11ab

Now you want to add or subtract like terms

7a - 14ab + 14 - 8a - 15 + 11ab

(7a - 8a) (-14ab + 11ab) (14-15)

-1a-3ab-1

If you want you can have an answer of either:

-1a-3ab-1 or - a-3ab-1

7 (a - 2ab + 2) - 8a + (-15) + 11ab

= 7a - 14 ab + 14 - 8a - 15 + 11 ab

= (7a - 8a) + (-14ab + 11ab) + (14 - 15)

= - a - 3ab - 1