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