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r in (-oo:+oo)
3/25 = (-1/5)*r // - (-1/5)*r
3/25-((-1/5)*r) = 0
(1/5)*r+3/25 = 0
1/5*r+3/25 = 0 // - 3/25
1/5*r = -3/25 // : 1/5
r = -3/25/1/5
r = -3/5
r = -3/5
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