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