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m in (-oo:+oo)
(2*m)/8-12-3 = -12 // + 12
(2*m)/8-12-3+12 = 0
1/4*m-3 = 0 // + 3
1/4*m = 3 // : 1/4
m = 3/1/4
m = 12
m = 12
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