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x in (-oo:+oo)
(4/9)*x+8 = (8/9)*x // - (8/9)*x
(4/9)*x-((8/9)*x)+8 = 0
(4/9)*x+(-8/9)*x+8 = 0
8-4/9*x = 0 // - 8
-4/9*x = -8 // : -4/9
x = -8/(-4/9)
x = 18
x = 18
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