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r in (-oo:+oo)
(11/12)*r-((5/12)*r)-3 = 7 // - 7
(11/12)*r-((5/12)*r)-7-3 = 0
(11/12)*r+(-5/12)*r-7-3 = 0
1/2*r-10 = 0 // + 10
1/2*r = 10 // : 1/2
r = 10/1/2
r = 20
r = 20
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