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x in (-oo:+oo)
2/7 = 3*x // - 3*x
2/7-(3*x) = 0
2/7-3*x = 0
2/7-3*x = 0 // - 2/7
-3*x = -2/7 // : -3
x = -2/7/(-3)
x = 2/21
x = 2/21
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