Marla earned $39 baby-sitting this week. On Saturday she baby-sat 1 hour more that twice the number of hours she baby-sat on Friday. If she earns $3 per hour, how many hours did she baby-sit each day?
For instance, if "h" is "the number of hours she worked on Friday", then what would be the expression, in terms of h, for the number of hours she worked on Saturday?
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