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x in (-oo:+oo)
X/3 = 9*x // - 9*x
X/3-(9*x) = 0
X/3-9*x = 0
1/3*X-9*x = 0 // - 1/3*X
-9*x = -(1/3*X) // : -9
x = (-(1/3*X))/(-9)
x = 1/27*X
x = 1/27*X
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