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