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x in (-oo:+oo)
X/3-x = -6 // + 6
X/3-x+6 = 0
1/3*X-x+6 = 0 // - 1/3*X+6
-x = -(1/3*X+6) // * -1
x = 1/3*X+6
x = 1/3*X+6
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