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