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y=21000(1-0.12)^3
We move all terms to the left:
y-(21000(1-0.12)^3)=0
We add all the numbers together, and all the variables
y-(21000(0.88)^3)=0
We add all the numbers together, and all the variables
y-14310.912=0
We move all terms containing y to the left, all other terms to the right
y=14310.912
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