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x in (-oo:+oo)
5/7 = x/7 // - x/7
5/7-(x/7) = 0
5/7-1/7*x = 0 // - 5/7
-1/7*x = -5/7 // : -1/7
x = -5/7/(-1/7)
x = 5
x = 5
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