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r in (-oo:+oo)
3-(r/(-8))+4 = -5 // + 5
3-(r/(-8))+4+5 = 0
1/8*r+12 = 0 // - 12
1/8*r = -12 // : 1/8
r = -12/1/8
r = -96
r = -96
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