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(6/7)*x+1/2 = 4/9-(1/7)+4 // - 4/9-(1/7)+4
(6/7)*x+1/2-(4/9)+1/7-4 = 0
(6/7)*x+1/2-4/9+1/7-4 = 0
6/7*x-479/126 = 0 // + 479/126
6/7*x = 479/126 // : 6/7
x = 479/126/6/7
x = 479/108
x = 479/108
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