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x in (-oo:+oo)
X-18 = x/4 // - x/4
X-(x/4)-18 = 0
X-1/4*x-18 = 0 // - X-18
-1/4*x = -(X-18) // : -1/4
x = (-(X-18))/(-1/4)
x = -4*(18-X)
x = -4*(18-X)
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