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