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M in (-oo:+oo)
M/3 = 7/2 // - 7/2
M/3-(7/2) = 0
M/3-7/2 = 0
1/3*M-7/2 = 0 // + 7/2
1/3*M = 7/2 // : 1/3
M = 7/2/1/3
M = 21/2
M = 21/2
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