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Let the number of items Joey made be x
This would make the number of items Anton made be 3x+39

We know that:
# of Anton's items+ # of Joey's items= 79

So we use the variables
x+(3x+39)=79 \\ 4x+39=79 \\ 4x=40 \\ x=10

Anton made 3(10)+39=69
and Joey made 10 items