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r in (-oo:+oo)
8-(4*((1/8)*r-(7/2))) = 0
8-4*((1/8)*r-7/2) = 0
8-4*(1/8*r-7/2) = 0
8-4*(1/8*r-7/2) = 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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