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x in (-oo:+oo)
(m-(5*n))/7 = m+7*n // - m+7*n
(m-(5*n))/7-m-(7*n) = 0
(m-5*n)/7-m-7*n = 0
(m-5*n)/7+(7*(-m))/7+(-7*7*n)/7 = 0
m+7*(-m)-5*n-7*7*n = 0
-6*m-5*n-49*n = 0
-6*m-54*n = 0
(-6*m-54*n)/7 = 0
(-6*m-54*n)/7 = 0 // * 7
-6*m-54*n = 0
x belongs to the empty set
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