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