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x in (-oo:+oo)
X-(x/2) = 18 // - 18
X-(x/2)-18 = 0
X-1/2*x-18 = 0 // - X-18
-1/2*x = -(X-18) // : -1/2
x = (-(X-18))/(-1/2)
x = -2*(18-X)
x = -2*(18-X)
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