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x in (-oo:+oo)
4/9-x = 2/63 // - 2/63
4/9-x-(2/63) = 0
4/9-x-2/63 = 0
26/63-x = 0 // - 26/63
-x = -26/63 // * -1
x = 26/63
x = 26/63
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