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m in (-oo:+oo)
m/2+12.66 = 16.66 // - 16.66
m/2-16.66+12.66 = 0
1/2*m-4 = 0 // + 4
1/2*m = 4 // : 1/2
m = 4/1/2
m = 8
m = 8
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