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(4/5)*x+1/2 = 4/9-((1/5)*x)+4/9 // - 4/9-((1/5)*x)+4/9
(4/5)*x+(1/5)*x+1/2-(4/9)-(4/9) = 0
(4/5)*x+(1/5)*x+1/2-4/9-4/9 = 0
x-7/18 = 0 // + 7/18
x = 7/18
x = 7/18
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