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x in (-oo:+oo)
x/9 = 12/4 // - 12/4
x/9-(12/4) = 0
x/9-3 = 0
1/9*x-3 = 0 // + 3
1/9*x = 3 // : 1/9
x = 3/1/9
x = 27
x = 27
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