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x in (-oo:+oo)
x+x/2+1/2 = x-(2/3) // - x-(2/3)
x+x/2-x+1/2+2/3 = 0
1/2*x+7/6 = 0 // - 7/6
1/2*x = -7/6 // : 1/2
x = -7/6/1/2
x = -7/3
x = -7/3
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