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M in (-oo:+oo)
M/6-2.6 = 5.7 // - 5.7
M/6-5.7-2.6 = 0
1/6*M-8.3 = 0 // + 8.3
1/6*M = 8.3 // : 1/6
M = 8.3/1/6
M = 49.799999
M = 49.799999
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