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r in (-oo:+oo)
8 = (1/2)*r // - (1/2)*r
8-((1/2)*r) = 0
(-1/2)*r+8 = 0
8-1/2*r = 0 // - 8
-1/2*r = -8 // : -1/2
r = -8/(-1/2)
r = 16
r = 16
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