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x in (-oo:+oo)
X-((1/2)*x)-5 = 2 // - 2
X-((1/2)*x)-5-2 = 0
X+(-1/2)*x-5-2 = 0
X-1/2*x-7 = 0 // - X-7
-1/2*x = -(X-7) // : -1/2
x = (-(X-7))/(-1/2)
x = -2*(7-X)
x = -2*(7-X)
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