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M in (-oo:+oo)
M/0.3 = 90 // - 90
M/0.3-90 = 0
3.33333333*M-90 = 0 // + 90
3.33333333*M = 90 // : 3.33333333
M = 90/3.33333333
M = 27.00000003
M = 27.00000003
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