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Select the graph of the solution. Click until the correct graph appears. 3x + 1 < 7

filled circle 2
<-|-|-*o*-|-|->
2
empty circle from -2 to 2
<-|-|-o_|_|_|_o-|-|->
-2 2
empty circle at 2 to the < left <
<_|_|_|_|_o-|-|->

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