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M in (-oo:+oo)
(1/3)*(M-1) = 6 // - 6
(1/3)*(M-1)-6 = 0
1/3*(M-1)-6 = 0
1/3*(M-1)-6 = 0
1/3*M-19/3 = 0
1/3*M-19/3 = 0
1/3*M-19/3 = 0 // + 19/3
1/3*M = 19/3 // : 1/3
M = 19/3/1/3
M = 19
M = 19
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