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m in (-oo:+oo)
m/7 = 5*(2*m-4) // - 5*(2*m-4)
m/7-(5*(2*m-4)) = 0
m/7-5*(2*m-4) = 0
(-5*7*(2*m-4))/7+m/7 = 0
m-5*7*(2*m-4) = 0
140-69*m = 0
(140-69*m)/7 = 0
(140-69*m)/7 = 0 // * 7
140-69*m = 0
140-69*m = 0 // - 140
-69*m = -140 // : -69
m = -140/(-69)
m = 140/69
m = 140/69
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