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m in (-oo:+oo)
(1/6)*m-((3/5)*m)-(3/10) = -1/90 // + -1/90
(1/6)*m-((3/5)*m)-(3/10)-(-1/90) = 0
(1/6)*m+(-3/5)*m-3/10+1/90 = 0
-13/30*m-13/45 = 0 // + 13/45
-13/30*m = 13/45 // : -13/30
m = 13/45/(-13/30)
m = -2/3
m = -2/3
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