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(3/7)*x+8/9 = x-(376/63) // - x-(376/63)
(3/7)*x-x+8/9+376/63 = 0
48/7-4/7*x = 0 // - 48/7
-4/7*x = -48/7 // : -4/7
x = -48/7/(-4/7)
x = 12
x = 12
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