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1/343 = 7^2*x-6 // - 7^2*x-6
1/343-(7^2*x)+6 = 0
2059/343-49*x = 0 // - 2059/343
-49*x = -2059/343 // : -49
x = -2059/343/(-49)
x = 2059/16807
x = 2059/16807
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