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5=2.5*1.051^x
We move all terms to the left:
5-(2.5*1.051^x)=0
We get rid of parentheses
-2.5*1.051^x+5=0
We move all terms containing x to the left, all other terms to the right
-2.5*1.051^x=-5
x=-5/1
x=-5
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