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x in (-oo:+oo)
3/7 = x/861 // - x/861
3/7-(x/861) = 0
3/7-1/861*x = 0 // - 3/7
-1/861*x = -3/7 // : -1/861
x = -3/7/(-1/861)
x = 369
x = 369
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