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