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m in (-oo:+oo)
-(3*m)-5 = -26 // + 26
26-(3*m)-5 = 0
26-3*m-5 = 0
21-3*m = 0 // - 21
-3*m = -21 // : -3
m = -21/(-3)
m = 7
m = 7
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