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M in (-oo:+oo)
M/7 = 7/5 // - 7/5
M/7-(7/5) = 0
M/7-7/5 = 0
1/7*M-7/5 = 0 // + 7/5
1/7*M = 7/5 // : 1/7
M = 7/5/1/7
M = 49/5
M = 49/5
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