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(6/7)*x+5/9 = 62/63 // - 62/63
(6/7)*x+5/9-(62/63) = 0
(6/7)*x+5/9-62/63 = 0
6/7*x-3/7 = 0 // + 3/7
6/7*x = 3/7 // : 6/7
x = 3/7/6/7
x = 1/2
x = 1/2
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