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m in (-oo:+oo)
(5/6)*m+2*m+2 = -15 // + 15
(5/6)*m+2*m+2+15 = 0
17/6*m+17 = 0 // - 17
17/6*m = -17 // : 17/6
m = -17/17/6
m = -6
m = -6
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