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m in (-oo:+oo)
(3*m-3)/6 = 12 // - 12
(3*m-3)/6-12 = 0
(3*m-3)/6+(-12*6)/6 = 0
3*m-12*6-3 = 0
3*m-75 = 0
(3*m-75)/6 = 0
(3*m-75)/6 = 0 // * 6
3*m-75 = 0
3*m-75 = 0 // + 75
3*m = 75 // : 3
m = 75/3
m = 25
m = 25
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