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x in (-oo:+oo)
x+2*x-(2/3) = (5*x)/2 // - (5*x)/2
x+2*x-((5*x)/2)-(2/3) = 0
x+2*x+(-5/2)*x-2/3 = 0
1/2*x-2/3 = 0 // + 2/3
1/2*x = 2/3 // : 1/2
x = 2/3/1/2
x = 4/3
x = 4/3
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