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x in (-oo:+oo)
7/3 = 3*x // - 3*x
7/3-(3*x) = 0
7/3-3*x = 0
7/3-3*x = 0 // - 7/3
-3*x = -7/3 // : -3
x = -7/3/(-3)
x = 7/9
x = 7/9
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