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(2/7)*x+3*x+7 = 86/9 // - 86/9
(2/7)*x+3*x-(86/9)+7 = 0
(2/7)*x+3*x-86/9+7 = 0
23/7*x-23/9 = 0 // + 23/9
23/7*x = 23/9 // : 23/7
x = 23/9/23/7
x = 7/9
x = 7/9
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