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m in (-oo:+oo)
28 = (5/6)*m-12 // - (5/6)*m-12
12-((5/6)*m)+28 = 0
(-5/6)*m+12+28 = 0
40-5/6*m = 0 // - 40
-5/6*m = -40 // : -5/6
m = -40/(-5/6)
m = 48
m = 48
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