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m in (-oo:+oo)
-(3*m)-8 = 2*m+47 // - 2*m+47
-(3*m)-(2*m)-47-8 = 0
-3*m-2*m-47-8 = 0
-5*m-55 = 0 // + 55
-5*m = 55 // : -5
m = 55/(-5)
m = -11
m = -11
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