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r in (-oo:+oo)
(3/5)*r = 9/10 // - 9/10
(3/5)*r-(9/10) = 0
(3/5)*r-9/10 = 0
3/5*r-9/10 = 0 // + 9/10
3/5*r = 9/10 // : 3/5
r = 9/10/3/5
r = 3/2
r = 3/2
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