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