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Answer:
8ab + 9a -6
Discussion:
(3ab + 9a -2) - ( -5ab + 4) = => as -(-5ab) = +5ab and -(4) = -4
(3ab + 9a - 2) + 5ab -4 = => combine like terms
(3ab + 5ab) + 9a -2 -4 = => as 3ab + 5ab = 8 ab
Thank you,
MrB
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