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m in (-oo:+oo)
-(6*m)-7 = 23 // - 23
-(6*m)-23-7 = 0
-6*m-23-7 = 0
-6*m-30 = 0 // + 30
-6*m = 30 // : -6
m = 30/(-6)
m = -5
m = -5
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