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(2/3)*x-((8/9)*x) = 5 // - 5
(2/3)*x-((8/9)*x)-5 = 0
(2/3)*x+(-8/9)*x-5 = 0
-2/9*x-5 = 0 // + 5
-2/9*x = 5 // : -2/9
x = 5/(-2/9)
x = -45/2
x = -45/2
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