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x in (-oo:+oo)
(1/2)*x-3 = (2/3)*x-1 // - (2/3)*x-1
(1/2)*x-((2/3)*x)-3+1 = 0
(1/2)*x+(-2/3)*x-3+1 = 0
-1/6*x-2 = 0 // + 2
-1/6*x = 2 // : -1/6
x = 2/(-1/6)
x = -12
x = -12
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