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m in (-oo:+oo)
m/3.28 = 7.3 // - 7.3
m/3.28-7.3 = 0
0.30487805*m-7.3 = 0 // + 7.3
0.30487805*m = 7.3 // : 0.30487805
m = 7.3/0.30487805
m = 23.9439999
m = 23.9439999
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