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1/343 = 7^5*x+1 // - 7^5*x+1
1/343-(7^5*x)-1 = 0
-16807*x-342/343 = 0 // + 342/343
-16807*x = 342/343 // : -16807
x = 342/343/(-16807)
x = -342/5764801
x = -342/5764801
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