If the solution of the equation MX = 4-x is an integer, find the value of the positive integer M

∵mx=4-x
∴(m+1)x=4
M + 1 = ± 1 or ± 2 or ± 4, M = 0, - 2,1, - 3,3, - 5
That is, positive integer m = 1, or 3

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