This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: Write an expression for the sequence of operations. Add 3 to $x$, subtract the result from 1, then double what you have. Add 3 to $x$, double what you ...

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