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M in (-oo:+oo)
(21/1)/3 = 3*M-((2/2)/3) // - 3*M-((2/2)/3)
(21/1)/3-(3*M)+(2/2)/3 = 0
21/3-3*M+(2/2)/3 = 0
22/3-3*M = 0 // - 22/3
-3*M = -22/3 // : -3
M = -22/3/(-3)
M = 22/9
M = 22/9
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