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100000*1.07^(x)=80000*1.09^(x)
We move all terms to the left:
100000*1.07^(x)-(80000*1.09^(x))=0
Wy multiply elements
100000x-(80000*1.09^x)=0
We get rid of parentheses
100000x-80000*1.09^x=0
Wy multiply elements
100000x-80000x=0
We add all the numbers together, and all the variables
20000x=0
x=0/20000
x=0
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