Linda invests $13,000 for one year. Part is invested at 4%, another part at 5%, and the rest at 7%. The total income from all 3 investments is $705. The combined income from the 4% and 5% investments is $75 more than the income from the 7% investment. Find the amount invested at each rate
(can somebody please help me solve this problem, i am completely lost)

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cant be too bad

let amount invested at 4% be x
ammount at 5% be y
amount at 7% be z

we know that the total amount invested is 13000
so x+y+z = 13000 ( one eqn )

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