7ab + 8 BC - 9ac + - 7ac + 6bc + - 3 BC + 4ab- 5ac
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7ab + 8 BC - 9ac + (- 7ac) + 6bc + (- 3 BC) + 4ab- 5ac
7ab+4ab +8BC +6bc -3BC -9ac -7ac -5ac
11ab +11bc -12 ac.
11b(a+c) -12ac
hope it helps u.
7ab+4ab +8BC +6bc -3BC -9ac -7ac -5ac
11ab +11bc -12 ac.
11b(a+c) -12ac
hope it helps u.
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i calculated this sum and answer is 1
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