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x in (-oo:+oo)
2/7 = x/5 // - x/5
2/7-(x/5) = 0
2/7-1/5*x = 0 // - 2/7
-1/5*x = -2/7 // : -1/5
x = -2/7/(-1/5)
x = 10/7
x = 10/7
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