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r in (-oo:+oo)
(2/10)*r = 1/4 // - 1/4
(2/10)*r-(1/4) = 0
(2/10)*r-1/4 = 0
1/5*r-1/4 = 0 // + 1/4
1/5*r = 1/4 // : 1/5
r = 1/4/1/5
r = 5/4
r = 5/4
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