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x in (-oo:+oo)
(1/2)*x-((2/3)*x) = 4 // - 4
(1/2)*x-((2/3)*x)-4 = 0
(1/2)*x+(-2/3)*x-4 = 0
-1/6*x-4 = 0 // + 4
-1/6*x = 4 // : -1/6
x = 4/(-1/6)
x = -24
x = -24
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