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x in (-oo:+oo)
(4*x)/6 = 12/2 // - 12/2
(4*x)/6-(12/2) = 0
(4*x)/6-6 = 0
2/3*x-6 = 0 // + 6
2/3*x = 6 // : 2/3
x = 6/2/3
x = 9
x = 9
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