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x in (-oo:+oo)
7 = 2*x-(1/3) // - 2*x-(1/3)
1/3-(2*x)+7 = 0
1/3-2*x+7 = 0
22/3-2*x = 0 // - 22/3
-2*x = -22/3 // : -2
x = -22/3/(-2)
x = 11/3
x = 11/3
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