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m in (-oo:+oo)
4*m-((5/6)*m)+5/6 = -15 // + 15
4*m-((5/6)*m)+5/6+15 = 0
(-5/6)*m+4*m+5/6+15 = 0
19/6*m+95/6 = 0 // - 95/6
19/6*m = -95/6 // : 19/6
m = -95/6/19/6
m = -5
m = -5
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