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m in (-oo:+oo)
-18-5 = m/(-3) // - m/(-3)
-(m/(-3))-18-5 = 0
1/3*m-23 = 0 // + 23
1/3*m = 23 // : 1/3
m = 23/1/3
m = 69
m = 69
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