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M in (-oo:+oo)
M/9 = 7/4 // - 7/4
M/9-(7/4) = 0
M/9-7/4 = 0
1/9*M-7/4 = 0 // + 7/4
1/9*M = 7/4 // : 1/9
M = 7/4/1/9
M = 63/4
M = 63/4
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