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m in (-oo:+oo)
(-8/9)*m = 12 // - 12
(-8/9)*m-12 = 0
-8/9*m-12 = 0 // + 12
-8/9*m = 12 // : -8/9
m = 12/(-8/9)
m = -27/2
m = -27/2
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