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