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r in (-oo:+oo)
4*r+(3*22)/18-(8/16)+1 = r+(72/3)/3 // - r+(72/3)/3
4*r-r+(3*22)/18-(8/16)-((72/3)/3)+1 = 0
4*r-r+(3*22)/18-1/2-8+1 = 0
3*r-23/6 = 0 // + 23/6
3*r = 23/6 // : 3
r = 23/6/3
r = 23/18
r = 23/18
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