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M in (-oo:+oo)
M/5 = 7/8 // - 7/8
M/5-(7/8) = 0
M/5-7/8 = 0
1/5*M-7/8 = 0 // + 7/8
1/5*M = 7/8 // : 1/5
M = 7/8/1/5
M = 35/8
M = 35/8
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