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x in (-oo:+oo)
(2/4)*x-((2/3)*x) = -1 // + 1
(2/4)*x-((2/3)*x)+1 = 0
(2/4)*x+(-2/3)*x+1 = 0
1-1/6*x = 0 // - 1
-1/6*x = -1 // : -1/6
x = -1/(-1/6)
x = 6
x = 6
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