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40=3^t/5
We move all terms to the left:
40-(3^t/5)=0
We get rid of parentheses
-3^t/5+40=0
We multiply all the terms by the denominator
-3^t+40*5=0
We add all the numbers together, and all the variables
-3^t+200=0
We move all terms containing t to the left, all other terms to the right
-3^t=-200
t=-200/1
t=-200
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