For red peppers lets say R, and for green, let's say G.
So R+G=7
Since he has 3 MORE red peppers than green peppers, R would become (G+3)
Lets rewrite the equation.
G+3+G=7, 2G+3=7 , 2G=4, G=2
Since Nate hase 2 green pepper, he would have 3+2 red peppers.
Nate has 5 Red Peppers