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20000=10000*1.1^x
We move all terms to the left:
20000-(10000*1.1^x)=0
We get rid of parentheses
-10000*1.1^x+20000=0
Wy multiply elements
-10000x+20000=0
We move all terms containing x to the left, all other terms to the right
-10000x=-20000
x=-20000/-10000
x=+2
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