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Given the differential equation (7x + kx 14 ym + 19y) dx + (19x + 2xy-4+ 23 y) dy = 0, find the constant

Given the differential equation (7x + kx 14 ym + 19y) dx + (19x + 2xy-4+ 23 y) dy = 0, find the constant real numbers k, m and n so that the differential equation is exact.

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