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r in (-oo:+oo)
2*r-5 = (3/4)*r // - (3/4)*r
2*r-((3/4)*r)-5 = 0
2*r+(-3/4)*r-5 = 0
5/4*r-5 = 0 // + 5
5/4*r = 5 // : 5/4
r = 5/5/4
r = 4
r = 4
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