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m in (-oo:+oo)
(2*m)/5 = 2*m-12 // - 2*m-12
(2*m)/5-(2*m)+12 = 0
(2*m)/5-2*m+12 = 0
12-8/5*m = 0 // - 12
-8/5*m = -12 // : -8/5
m = -12/(-8/5)
m = 15/2
m = 15/2
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