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r in (-oo:+oo)
-18 = r/2-6 // - r/2-6
6-(r/2)-18 = 0
-1/2*r-12 = 0 // + 12
-1/2*r = 12 // : -1/2
r = 12/(-1/2)
r = -24
r = -24
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