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M in (-oo:+oo)
M/0.6 = 20 // - 20
M/0.6-20 = 0
1.66666667*M-20 = 0 // + 20
1.66666667*M = 20 // : 1.66666667
M = 20/1.66666667
M = 11.99999998
M = 11.99999998
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