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m in (-oo:+oo)
12 = (2*m)/5 // - (2*m)/5
12-((2*m)/5) = 0
(-2/5)*m+12 = 0
12-2/5*m = 0 // - 12
-2/5*m = -12 // : -2/5
m = -12/(-2/5)
m = 30
m = 30
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