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(8/9)*x+(2/3)*x = (1/9)*x+45 // - (1/9)*x+45
(8/9)*x+(2/3)*x-((1/9)*x)-45 = 0
(8/9)*x+(2/3)*x+(-1/9)*x-45 = 0
13/9*x-45 = 0 // + 45
13/9*x = 45 // : 13/9
x = 45/13/9
x = 405/13
x = 405/13
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