8ab - {a(9b - 5) - b(a + 1)}
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what do we have to do with this???
what's the question???
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Step-by-step explanation:
8ab - {a(9b - 5) - b(a+ 1)}
= 8ab - { 9ab - 5a -ab - 5}
= 8ab - 8ab + 5a + 5
= 5a + 5
= 5(a + 1)
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