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(2/3)*x-((5/9)*x) = 3 // - 3
(2/3)*x-((5/9)*x)-3 = 0
(2/3)*x+(-5/9)*x-3 = 0
1/9*x-3 = 0 // + 3
1/9*x = 3 // : 1/9
x = 3/1/9
x = 27
x = 27
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