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s=1.02^4+1.02^3+1.02^2+1.02^1+1
We move all terms to the left:
s-(1.02^4+1.02^3+1.02^2+1.02^1+1)=0
We add all the numbers together, and all the variables
s-5.20404016=0
We move all terms containing s to the left, all other terms to the right
s=5.20404016
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