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x in (-oo:+oo)
4*x-(4/(-9)) = 12 // - 12
4*x-(4/(-9))-12 = 0
4*x+4/9-12 = 0
4*x-104/9 = 0 // + 104/9
4*x = 104/9 // : 4
x = 104/9/4
x = 26/9
x = 26/9
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