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