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x in (-oo:+oo)
(2/3)*(6-(3*x)) = 1-x-x+3 // - 1-x-x+3
(2/3)*(6-(3*x))+x+x-3-1 = 0
(2/3)*(6-3*x)+x+x-3-1 = 0
2/3*(6-3*x)+x+x-3-1 = 0
2/3*(6-3*x)+x+x-3-1 = 0
x-x-3-1+4 = 0
4-3-1 = 0
1-1 = 0
0 = 0
0 = 0
x belongs to the empty set
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