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x in (-oo:+oo)
1/3-3*x = -7/3 // + -7/3
1/3-3*x-(-7/3) = 0
1/3-3*x+7/3 = 0
8/3-3*x = 0 // - 8/3
-3*x = -8/3 // : -3
x = -8/3/(-3)
x = 8/9
x = 8/9
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