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x in (-oo:+oo)
8/9-4*x = -64/9 // + -64/9
8/9-4*x-(-64/9) = 0
8/9-4*x+64/9 = 0
8-4*x = 0 // - 8
-4*x = -8 // : -4
x = -8/(-4)
x = 2
x = 2
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