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(7*x)/9-((2*x)/9) = 10/9 // - 10/9
(7*x)/9-((2*x)/9)-(10/9) = 0
(7*x)/9+(-2/9)*x-10/9 = 0
5/9*x-10/9 = 0 // + 10/9
5/9*x = 10/9 // : 5/9
x = 10/9/5/9
x = 2
x = 2
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