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x in (-oo:+oo)
9*x = 1/2 // - 1/2
9*x-(1/2) = 0
9*x-1/2 = 0
9*x-1/2 = 0 // + 1/2
9*x = 1/2 // : 9
x = 1/2/9
x = 1/18
x = 1/18
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