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m in (-oo:+oo)
(5/7)*m+1 = m+39/49 // - m+39/49
(5/7)*m-m-(39/49)+1 = 0
(5/7)*m-m-39/49+1 = 0
10/49-2/7*m = 0 // - 10/49
-2/7*m = -10/49 // : -2/7
m = -10/49/(-2/7)
m = 5/7
m = 5/7
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