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