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x in (-oo:+oo)
(1/3)*(19-x)+(1/3)*x = 1 // - 1
(1/3)*(19-x)+(1/3)*x-1 = 0
1/3*(19-x)+x/3-1 = 0
(1/3*3*(19-x))/3+x/3+(-1*3)/3 = 0
1/3*3*(19-x)+x-1*3 = 0
19-3 = 0
16 = 0
16/3 = 0
16/3 = 0 // * 3
16 = 0
x belongs to the empty set
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