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r in (-oo:+oo)
r/12 = 3/4 // - 3/4
r/12-(3/4) = 0
r/12-3/4 = 0
1/12*r-3/4 = 0 // + 3/4
1/12*r = 3/4 // : 1/12
r = 3/4/1/12
r = 9
r = 9
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