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m in (-oo:+oo)
(9/20)*m+2/8 = (7/8)*m+23/20 // - (7/8)*m+23/20
(9/20)*m-((7/8)*m)+2/8-(23/20) = 0
(9/20)*m+(-7/8)*m+2/8-23/20 = 0
-17/40*m-9/10 = 0 // + 9/10
-17/40*m = 9/10 // : -17/40
m = 9/10/(-17/40)
m = -36/17
m = -36/17
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