Abhay's Math

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			ab + 2cd = 3a + 4b + 5c + 7d + 8

			ab - 3a + 2cd - 5c = 4b + 7d + 8

			a(b - 3) + 2c(d - 5/2) = 4(b - 3 + 3) + 7(d - 5/2 + 5/2) + 8

			(a - 4)(b - 3) + (2c - 7)(d - 5/2) = 20 + 35/2

			2(a - 4)(b - 3) + (2c - 7)(2d - 5) = 75			

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