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