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r in (-oo:+oo)
5*r-(8/10) = r/4 // - r/4
5*r-(r/4)-(8/10) = 0
5*r-(r/4)-4/5 = 0
19/4*r-4/5 = 0 // + 4/5
19/4*r = 4/5 // : 19/4
r = 4/5/19/4
r = 16/95
r = 16/95
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