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r in (-oo:+oo)
4*r = 16/17 // - 16/17
4*r-(16/17) = 0
4*r-16/17 = 0
4*r-16/17 = 0 // + 16/17
4*r = 16/17 // : 4
r = 16/17/4
r = 4/17
r = 4/17
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