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m in (-oo:+oo)
-(5*m)-5 = 55 // - 55
-(5*m)-55-5 = 0
-5*m-55-5 = 0
-5*m-60 = 0 // + 60
-5*m = 60 // : -5
m = 60/(-5)
m = -12
m = -12
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