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m in (-oo:+oo)
m/2+4 = m+10 // - m+10
m/2-m-10+4 = 0
-1/2*m-6 = 0 // + 6
-1/2*m = 6 // : -1/2
m = 6/(-1/2)
m = -12
m = -12
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