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m in (-oo:+oo)
-(2*m)-4 = -14 // + 14
14-(2*m)-4 = 0
14-2*m-4 = 0
10-2*m = 0 // - 10
-2*m = -10 // : -2
m = -10/(-2)
m = 5
m = 5
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