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r in (-oo:+oo)
-2 = -r/3 // + -r/3
-(-r/3)-2 = 0
(1/3)*r-2 = 0
1/3*r-2 = 0 // + 2
1/3*r = 2 // : 1/3
r = 2/1/3
r = 6
r = 6
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