Frank bought supplies for school. In the first store, he spent half of his money plus $10. In the second store, he spent half of what he had left, plus $10. In the third store, he spent 80% of what he had left. He came home with $5. How much did he start out with?

1. store~x/2+10

2. store~(x-(x/2+10)/2)+10

3.store~(x)(4/5)

answer is -35

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