Benchmark

6+x=12
7
6
6+x=18
13
16
9+x=18
9
8
{"name":"Benchmark", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"6+x=12, 6+x=18, 9+x=18","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}
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