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x in (-oo:+oo)
5/7 = 3*x // - 3*x
5/7-(3*x) = 0
5/7-3*x = 0
5/7-3*x = 0 // - 5/7
-3*x = -5/7 // : -3
x = -5/7/(-3)
x = 5/21
x = 5/21
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