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x in (-oo:+oo)
X = 9*x-(4/15) // - 9*x-(4/15)
X-(9*x)+4/15 = 0
X-9*x+4/15 = 0
X-9*x+4/15 = 0 // - X+4/15
-9*x = -(X+4/15) // : -9
x = (-(X+4/15))/(-9)
x = (X+4/15)/9
x = (X+4/15)/9
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