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m in (-oo:+oo)
-31 = 6*m+m+4 // - 6*m+m+4
-(6*m)-m-31-4 = 0
-6*m-m-31-4 = 0
-7*m-35 = 0 // + 35
-7*m = 35 // : -7
m = 35/(-7)
m = -5
m = -5
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