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r in (-oo:+oo)
(7/4)*r-1 = (3/4)*r // - (3/4)*r
(7/4)*r-((3/4)*r)-1 = 0
(7/4)*r+(-3/4)*r-1 = 0
r-1 = 0 // + 1
r = 1
r = 1
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