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x in (-oo:+oo)
x/9 = x+4 // - x+4
x/9-x-4 = 0
-8/9*x-4 = 0 // + 4
-8/9*x = 4 // : -8/9
x = 4/(-8/9)
x = -9/2
x = -9/2
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