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