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x in (-oo:+oo)
(5/9)*x-((1/3)*x)-1 = 3 // - 3
(5/9)*x-((1/3)*x)-3-1 = 0
(5/9)*x+(-1/3)*x-3-1 = 0
2/9*x-4 = 0 // + 4
2/9*x = 4 // : 2/9
x = 4/2/9
x = 18
x = 18
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