<human>:  Mark and Peter dug ponds in their backyards. Mark’s pond is 4 feet deeper than 3 times Peter’s pond. If Mark’s pond is 19 feet deep, what is the depth of Peter’s pond?
<bot>: Define a variable ** Let’s use p for the number of feet in Mark’s pond
Write an equation ** 3*p+4=19
Simplify ** 3*p=19-4=15
Simplify ** 3p=15
Simplify ** p=<<5=5>>5
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