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