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m in (-oo:+oo)
(12*m-9)/3 = -6 // + 6
(12*m-9)/3+6 = 0
(12*m-9)/3+(3*6)/3 = 0
12*m+3*6-9 = 0
12*m+9 = 0
(12*m+9)/3 = 0
(12*m+9)/3 = 0 // * 3
12*m+9 = 0
12*m+9 = 0 // - 9
12*m = -9 // : 12
m = -9/12
m = -3/4
m = -3/4
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