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