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x in (-oo:+oo)
(2/3)*x = (1/2)*x-(1/18) // - (1/2)*x-(1/18)
(2/3)*x-((1/2)*x)+1/18 = 0
(2/3)*x+(-1/2)*x+1/18 = 0
1/6*x+1/18 = 0 // - 1/18
1/6*x = -1/18 // : 1/6
x = -1/18/1/6
x = -1/3
x = -1/3
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