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