Represent 2-step word problems with equations

Problem

When I started my rock collection I had 8 rocks. Over the summer I collected 48 additional rocks. At the end of the summer I gave away some of my favorite rocks to friends, but I still have 49 rocks left.
Which equation could I use to find out how many rocks left parenthesis, start color blueD, r, end color blueD, right parenthesis I gave away to friends?
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