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R in (-oo:+oo)
R/12 = (1/9)/10 // - (1/9)/10
R/12-((1/9)/10) = 0
R/12-1/90 = 0
1/12*R-1/90 = 0 // + 1/90
1/12*R = 1/90 // : 1/12
R = 1/90/1/12
R = 2/15
R = 2/15
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