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M in (-oo:+oo)
M/5 = 0.23 // - 0.23
M/5-0.23 = 0
1/5*M-0.23 = 0 // + 0.23
1/5*M = 0.23 // : 1/5
M = 0.23/1/5
M = 1.15
M = 1.15
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