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r in (-oo:+oo)
((1/3)/4)*r = (3/5)/8 // - (3/5)/8
((1/3)/4)*r-((3/5)/8) = 0
((1/3)/4)*r-3/40 = 0
1/12*r-3/40 = 0 // + 3/40
1/12*r = 3/40 // : 1/12
r = 3/40/1/12
r = 9/10
r = 9/10
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