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r in (-oo:+oo)
2/3 = r/18 // - r/18
2/3-(r/18) = 0
2/3-1/18*r = 0 // - 2/3
-1/18*r = -2/3 // : -1/18
r = -2/3/(-1/18)
r = 12
r = 12
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