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m in (-oo:+oo)
-4 = -((5/6)*m)-9 // + -((5/6)*m)-9
(5/6)*m-4+9 = 0
5/6*m+5 = 0 // - 5
5/6*m = -5 // : 5/6
m = -5/5/6
m = -6
m = -6
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