A possible answer can be n = 1/10 + rt/-10.
I brought the - 4n over to the other side and the +1 to the other side, giving me -10n = -1 + rt. I divided it all by - 10, which gave me n=-1/-10 + rt/-10. Since two negatives cancel each other out and becomes a positive, -1/-10 becomes 1/10.
