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