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R in (-oo:+oo)
8-(4*((1/8)*R-3.5)) = 0
8-4*((1/8)*R-3.5) = 0
8-4*(1/8*R-3.5) = 0
8-4*(1/8*R-3.5) = 0
22-1/2*R = 0
22-1/2*R = 0
22-1/2*R = 0 // - 22
-1/2*R = -22 // : -1/2
R = -22/(-1/2)
R = 44
R = 44
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