David borrows $15,000 for a new car. He is charged 6% simple interest per year. If he paid $4500 in interest, how many years did
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x + (x + 3) + = 75
so you will add up all of the x 's but NOT the x^2
2x + 3 + = 75
Rearrange to put the x^2 in front of 2x
+ 2x + 3 = 75
subtract the 75 from both sides
+ 2x - 72 = 0
