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Q. 4.    (b) What should be subtracted from 2a+8b+10  to get -3a+7b+16 ?

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Let the term be c which must be subtracted from 2a + 8b + 10 to get -3a + 7b + 16

\\2a + 8b + 10 - c = -3a + 7b + 16 \\c = 2a + 8b + 10 - (-3a + 7b + 16) \\c = 2a + 8b + 10 + 3a - 7b - 16 \\c = (2 + 3)a + (8 - 7)b + 10 - 16 \\c = 5a + b - 6

5a + b - 6 must be subtracted from 2a + 8b + 10 to get -3a + 7b + 16

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Sayak

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