If M is a positive integer, then the positive integer solution of the equation 2x + 5m = 18-x about X is

2x+5m=18-x,3x=18-5m,3x-18=-5m 5m=3(6-x)
Because m is a positive integer, X is a positive integer
X = 1,2,3,4,5,6, M = 3,12 / 5,9 / 5,6 / 5,3 / 5,0
So when m is a positive integer 3, x = 1 is its solution

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