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M in (-oo:+oo)
3*M+8/2 = 5*M+7/4 // - 5*M+7/4
3*M-(5*M)+8/2-(7/4) = 0
3*M-5*M+8/2-7/4 = 0
9/4-2*M = 0 // - 9/4
-2*M = -9/4 // : -2
M = -9/4/(-2)
M = 9/8
M = 9/8
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