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m in (-oo:+oo)
(6/7)*m-5*m+1 = 39/10 // - 39/10
(6/7)*m-5*m-(39/10)+1 = 0
(6/7)*m-5*m-39/10+1 = 0
-29/7*m-29/10 = 0 // + 29/10
-29/7*m = 29/10 // : -29/7
m = 29/10/(-29/7)
m = -7/10
m = -7/10
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