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8/9-(5*x)-(6*x) = -685/9 // + -685/9
8/9-(5*x)-(6*x)-(-685/9) = 0
8/9-5*x-6*x+685/9 = 0
77-11*x = 0 // - 77
-11*x = -77 // : -11
x = -77/(-11)
x = 7
x = 7
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