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r in (-oo:+oo)
(66/22)*r+16/16-1 = r+(72/3)/3 // - r+(72/3)/3
(66/22)*r-r+16/16-((72/3)/3)-1 = 0
(66/22)*r-r+16/16-8-1 = 0
2*r-8 = 0 // + 8
2*r = 8 // : 2
r = 8/2
r = 4
r = 4
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