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m in (-oo:+oo)
3/8-((6/7)*m) = -3/56 // + -3/56
3/8-((6/7)*m)-(-3/56) = 0
(-6/7)*m+3/8+3/56 = 0
3/7-6/7*m = 0 // - 3/7
-6/7*m = -3/7 // : -6/7
m = -3/7/(-6/7)
m = 1/2
m = 1/2
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