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10-23.

Quinn started off with twice as much candy as Denali, but then he ate $4$ pieces. When Quinn and Denali put their candy together, they now have a total of $50$ pieces. How many pieces of candy did Denali start with?

Let $x$ represent the number of pieces of candy that Denali had.
What algebraic expression would represent Quinn's number of pieces of candy?

Quinn would have $2x$ pieces of candy to begin with.
After he ate four pieces, he would have how many pieces of candy?

Create an equation representing the sum of their two candy supplies that should equal to $50$.