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r in (-oo:+oo)
(1/6)*r-((-1/3)*r) = -2 // + 2
(1/6)*r-((-1/3)*r)+2 = 0
(1/6)*r+(1/3)*r+2 = 0
1/2*r+2 = 0 // - 2
1/2*r = -2 // : 1/2
r = -2/1/2
r = -4
r = -4
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