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x in (-oo:+oo)
1/343 = 16807-(4*x) // - 16807-(4*x)
4*x+1/343-16807 = 0
4*x-5764800/343 = 0 // + 5764800/343
4*x = 5764800/343 // : 4
x = 5764800/343/4
x = 1441200/343
x = 1441200/343
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