It is known that the quadratic power of polynomial (A-2) x + (B-5) xy-x = Y-7 is a polynomial about x.y. if the polynomial does not contain quadratic term, find the value of 3A + 2B

Because there is no quadratic equation, the coefficient of quadratic term is zero, A-2 = 0, 2b + 1 = 0, so a = 2, B = - 0.5, 3A + 8b = 2

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