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R in (-oo:+oo)
R/2 = 5.7 // - 5.7
R/2-5.7 = 0
1/2*R-5.7 = 0 // + 5.7
1/2*R = 5.7 // : 1/2
R = 5.7/1/2
R = 11.4
R = 11.4
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