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x in (-oo:+oo)
x/2-x-(2/3) = 3/2 // - 3/2
x/2-x-(2/3)-(3/2) = 0
x/2-x-2/3-3/2 = 0
-1/2*x-13/6 = 0 // + 13/6
-1/2*x = 13/6 // : -1/2
x = 13/6/(-1/2)
x = -13/3
x = -13/3
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