need help math
posted by mark on .
Solve the problem. Roberto invested some money at 7%, and then invested $2000 more than twice this amount at 11%. His total annual income from the two investments was $3990. How much was invested at 11%?

Set up an algebra equation
X*.07 + (2000+2*X)*.11 = 3990.
Solve for X and then for 2000+2X