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