Joanie is four more than two times older than Robbie. If Joanie's age (j) is 56 years old, which of the following equations can be used to determine Robbie's age (r)?

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Joanie is four more than two times older than Robbie. If Joanie's age (<i>j</i>) is 56 years old, which of the following equations can be used to determine Robbie's age (<i>r)</i>?