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m in (-oo:+oo)
139/49 = 2*m+(1/7)*m+1 // - 2*m+(1/7)*m+1
139/49-(2*m)-((1/7)*m)-1 = 0
(-1/7)*m-2*m+139/49-1 = 0
90/49-15/7*m = 0 // - 90/49
-15/7*m = -90/49 // : -15/7
m = -90/49/(-15/7)
m = 6/7
m = 6/7
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