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r in (-oo:+oo)
1/4+9 = 10-((3/4)*r) // - 10-((3/4)*r)
(3/4)*r+1/4-10+9 = 0
3/4*r-3/4 = 0 // + 3/4
3/4*r = 3/4 // : 3/4
r = 3/4/3/4
r = 1
r = 1
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