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m in (-oo:+oo)
0.5 = m/120 // - m/120
0.5-(m/120) = 0
0.5-1/120*m = 0 // - 0.5
-1/120*m = -0.5 // : -1/120
m = -0.5/(-1/120)
m = 60.000024
m = 60.000024
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