Mathematics, 19.02.2021 02:40, ayoismeisjjjjuan

Arianna bought 2 thingamajigs and 5 doohickies for $31. Samantha bought one thingamajig and 2 doohickies for $13. How much does a thingamajig cost?

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Arianna bought 2 thingamajigs and 5 doohickies for $31. Samantha bought one thingamajig and 2 doohic...