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(4*(2*r-4))/7 = 4*R-(5/5) // - 4*R-(5/5)
(4*(2*r-4))/7-(4*R)+5/5 = 0
(4*(2*r-4))/7-4*R+5/5 = 0
(4*(2*r-4))/7-4*R+1 = 0
(4*(2*r-4))/7+(-4*7*R)/7+(1*7)/7 = 0
4*(2*r-4)-4*7*R+1*7 = 0
8*r-28*R-16+7 = 0
8*r-28*R-9 = 0
(8*r-28*R-9)/7 = 0
(8*r-28*R-9)/7 = 0 // * 7
8*r-28*R-9 = 0
x belongs to the empty set
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