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m in (-oo:+oo)
3*(1*m+1) = 12 // - 12
3*(1*m+1)-12 = 0
3*(m+1)-12 = 0
3*(m+1)-12 = 0
3*m-9 = 0
3*m-9 = 0
3*m-9 = 0 // + 9
3*m = 9 // : 3
m = 9/3
m = 3
m = 3
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