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x in (-oo:+oo)
x = (2/9)*x+(1/3)*x+8 // - (2/9)*x+(1/3)*x+8
x-((2/9)*x)-((1/3)*x)-8 = 0
x+(-2/9)*x+(-1/3)*x-8 = 0
4/9*x-8 = 0 // + 8
4/9*x = 8 // : 4/9
x = 8/4/9
x = 18
x = 18
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