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m in (-oo:+oo)
(1/8)*m-12-3 = -12 // + 12
(1/8)*m-12-3+12 = 0
1/8*m-3 = 0 // + 3
1/8*m = 3 // : 1/8
m = 3/1/8
m = 24
m = 24
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