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x in (-oo:+oo)
(1/3)*(m-1) = 23-(3*r) // - 23-(3*r)
(1/3)*(m-1)+3*r-23 = 0
1/3*(m-1)+3*r-23 = 0
1/3*(m-1)+3*r-23 = 0
1/3*m+3*r-23-1/3 = 0
1/3*m+3*r-70/3 = 0
1/3*m+3*r-70/3 = 0
x belongs to the empty set
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