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m in (-oo:+oo)
47 = -6*m-(6*m)-1 // + -6*m-(6*m)-1
6*m-(-6*m)+1+47 = 0
6*m+6*m+1+47 = 0
12*m+48 = 0 // - 48
12*m = -48 // : 12
m = -48/12
m = -4
m = -4
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