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