Plz someone has to help plz , will mark as brainlest

Does anyone know how to do geometryme with this problem

Yuto solved the equation below. what is the solution to yuto’s equation?

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?