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r in (-oo:+oo)
6 = -r/3 // + -r/3
6-(-r/3) = 0
(1/3)*r+6 = 0
1/3*r+6 = 0 // - 6
1/3*r = -6 // : 1/3
r = -6/1/3
r = -18
r = -18
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