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m in (-oo:+oo)
6*(2*m+3) = -42 // + 42
6*(2*m+3)+42 = 0
6*(2*m+3)+42 = 0
12*m+60 = 0
12*m+60 = 0
12*m+60 = 0 // - 60
12*m = -60 // : 12
m = -60/12
m = -5
m = -5
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