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x in (-oo:+oo)
x-6 = (1/3)*x // - (1/3)*x
x-((1/3)*x)-6 = 0
x+(-1/3)*x-6 = 0
2/3*x-6 = 0 // + 6
2/3*x = 6 // : 2/3
x = 6/2/3
x = 9
x = 9
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