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0=80*0.4^t
We move all terms to the left:
0-(80*0.4^t)=0
We add all the numbers together, and all the variables
-(80*0.4^t)=0
We get rid of parentheses
-80*0.4^t=0
Wy multiply elements
0t=0
We add all the numbers together, and all the variables
t=0
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