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r in (-oo:+oo)
-6 = 12-((3/4)*r) // - 12-((3/4)*r)
(3/4)*r-12-6 = 0
3/4*r-18 = 0 // + 18
3/4*r = 18 // : 3/4
r = 18/3/4
r = 24
r = 24
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