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(5*m-(3*n))/9 = f // - f
(5*m-(3*n))/9-f = 0
(5*m-3*n)/9-f = 0
(5*m-3*n)/9+(9*(-f))/9 = 0
9*(-f)+5*m-3*n = 0
5*m-9*f-3*n = 0
(5*m-9*f-3*n)/9 = 0
(5*m-9*f-3*n)/9 = 0 // * 9
5*m-9*f-3*n = 0
x belongs to the empty set
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