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0=0.65^t-0.1
We move all terms to the left:
0-(0.65^t-0.1)=0
We add all the numbers together, and all the variables
-(0.65^t-0.1)=0
We get rid of parentheses
-0.65^t+0.1=0
We move all terms containing t to the left, all other terms to the right
-0.65^t=-0.1
t=-0.1/1
t=-0.1
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