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r in (-oo:+oo)
14/10-r = -4/1 // + -4/1
14/10-r-(-4/1) = 0
14/10-r+4 = 0
27/5-r = 0 // - 27/5
-r = -27/5 // * -1
r = 27/5
r = 27/5
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