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