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