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y=20(1-0.9)^4
We move all terms to the left:
y-(20(1-0.9)^4)=0
We add all the numbers together, and all the variables
y-(20(0.1)^4)=0
We add all the numbers together, and all the variables
y-0.002=0
We move all terms containing y to the left, all other terms to the right
y=0.002
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