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x in (-oo:+oo)
X-6 = (1/3)*x // - (1/3)*x
X-((1/3)*x)-6 = 0
X+(-1/3)*x-6 = 0
X-1/3*x-6 = 0 // - X-6
-1/3*x = -(X-6) // : -1/3
x = (-(X-6))/(-1/3)
x = -3*(6-X)
x = -3*(6-X)
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