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(x+36)/5 = x // - x
(x+36)/5-x = 0
(x+36)/5+(5*(-x))/5 = 0
x+5*(-x)+36 = 0
36-4*x = 0
(36-4*x)/5 = 0
(36-4*x)/5 = 0 // * 5
36-4*x = 0
36-4*x = 0 // - 36
-4*x = -36 // : -4
x = -36/(-4)
x = 9
x = 9
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