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bobbi, kate, and rebecca earned a combined 12 points during their team's game. bobbi earned 6 points and kate earned 3 points. which of the following equations can be used to determine how many points rebecca earned?

6 + 3 + n = 12
3x + 6 = 12
6 + 3 = 12 + n
6x + 3 = 12

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