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M in (-oo:+oo)
M/2.8-4.9 = 7.11 // - 7.11
M/2.8-7.11-4.9 = 0
0.35714286*M-12.01 = 0 // + 12.01
0.35714286*M = 12.01 // : 0.35714286
M = 12.01/0.35714286
M = 33.62799973
M = 33.62799973
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