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(2/3)*x-((5/9)*x) = 4 // - 4
(2/3)*x-((5/9)*x)-4 = 0
(2/3)*x+(-5/9)*x-4 = 0
1/9*x-4 = 0 // + 4
1/9*x = 4 // : 1/9
x = 4/1/9
x = 36
x = 36
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