Math hw I can't figure out

Question

Miguel bought a desktop computer and a laptop computer. Before finance charges, the laptop cost $450 less than the desktop. He paid for the computers using two different financing plans. For the desktop the interest rate was 7% per year, and for the laptop it was 5.5% per year. The total finance charges for one year were $279. How much did each computer cost before finance charges?

Answer 1

d represents the cost of the desktop

d - 450 represents the cost of the laptop

0.07d + 0.055(d - 450) = 279

Can you solve for d and answer?