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R in (-oo:+oo)
R/36 = 2/9 // - 2/9
R/36-(2/9) = 0
R/36-2/9 = 0
1/36*R-2/9 = 0 // + 2/9
1/36*R = 2/9 // : 1/36
R = 2/9/1/36
R = 8
R = 8
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