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M in (-oo:+oo)
M/0.6 = 7 // - 7
M/0.6-7 = 0
1.66666667*M-7 = 0 // + 7
1.66666667*M = 7 // : 1.66666667
M = 7/1.66666667
M = 4.19999999
M = 4.19999999
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