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m in (-oo:+oo)
13.2/6 = m/2 // - m/2
13.2/6-(m/2) = 0
2.2-1/2*m = 0 // - 2.2
-1/2*m = -2.2 // : -1/2
m = -2.2/(-1/2)
m = 4.4
m = 4.4
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