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M in (-oo:+oo)
M/9 = 5/3 // - 5/3
M/9-(5/3) = 0
M/9-5/3 = 0
1/9*M-5/3 = 0 // + 5/3
1/9*M = 5/3 // : 1/9
M = 5/3/1/9
M = 15
M = 15
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