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x in (-oo:+oo)
X-(9/9) = x/3 // - x/3
X-(x/3)-(9/9) = 0
X-(x/3)-1 = 0
X-1/3*x-1 = 0 // - X-1
-1/3*x = -(X-1) // : -1/3
x = (-(X-1))/(-1/3)
x = -3*(1-X)
x = -3*(1-X)
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