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m in (-oo:+oo)
3*(2*m+1) = -57 // + 57
3*(2*m+1)+57 = 0
3*(2*m+1)+57 = 0
6*m+60 = 0
6*m+60 = 0
6*m+60 = 0 // - 60
6*m = -60 // : 6
m = -60/6
m = -10
m = -10
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