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