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11/18+7/9 = (5*x)/9 // - (5*x)/9
11/18-((5*x)/9)+7/9 = 0
(-5/9)*x+11/18+7/9 = 0
25/18-5/9*x = 0 // - 25/18
-5/9*x = -25/18 // : -5/9
x = -25/18/(-5/9)
x = 5/2
x = 5/2
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