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