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x in (-oo:+oo)
6/4 = x/3 // - x/3
6/4-(x/3) = 0
3/2-1/3*x = 0 // - 3/2
-1/3*x = -3/2 // : -1/3
x = -3/2/(-1/3)
x = 9/2
x = 9/2
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