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x in (-oo:+oo)
X-((1/3)*x) = -2 // + 2
X-((1/3)*x)+2 = 0
X+(-1/3)*x+2 = 0
X-1/3*x+2 = 0 // - X+2
-1/3*x = -(X+2) // : -1/3
x = (-(X+2))/(-1/3)
x = 3*(X+2)
x = 3*(X+2)
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