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r in (-oo:+oo)
(33/7)*(r-(1/3)) = -47/28 // + -47/28
(33/7)*(r-(1/3))-(-47/28) = 0
(33/7)*(r-1/3)+47/28 = 0
33/7*(r-1/3)+47/28 = 0
(33/7*28*(r-1/3))/28+47/28 = 0
33/7*28*(r-1/3)+47 = 0
132*r+3 = 0
(132*r+3)/28 = 0
(132*r+3)/28 = 0 // * 28
132*r+3 = 0
132*r+3 = 0 // - 3
132*r = -3 // : 132
r = -3/132
r = -1/44
r = -1/44
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