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M in (-oo:+oo)
(3*M)/5+8/3 = 64/15 // - 64/15
(3*M)/5+8/3-(64/15) = 0
(3*M)/5+8/3-64/15 = 0
3/5*M-8/5 = 0 // + 8/5
3/5*M = 8/5 // : 3/5
M = 8/5/3/5
M = 8/3
M = 8/3
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