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R in (-oo:+oo)
R/6+2/3 = 9 // - 9
R/6+2/3-9 = 0
1/6*R-25/3 = 0 // + 25/3
1/6*R = 25/3 // : 1/6
R = 25/3/1/6
R = 50
R = 50
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