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