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m in (-oo:+oo)
(4/5)*m-1 = (9/10)*m+4 // - (9/10)*m+4
(4/5)*m-((9/10)*m)-4-1 = 0
(4/5)*m+(-9/10)*m-4-1 = 0
-1/10*m-5 = 0 // + 5
-1/10*m = 5 // : -1/10
m = 5/(-1/10)
m = -50
m = -50
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