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m in (-oo:+oo)
3*(1*m+1) = 27 // - 27
3*(1*m+1)-27 = 0
3*(m+1)-27 = 0
3*(m+1)-27 = 0
3*m-24 = 0
3*m-24 = 0
3*m-24 = 0 // + 24
3*m = 24 // : 3
m = 24/3
m = 8
m = 8
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