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39=3.0t
We move all terms to the left:
39-(3.0t)=0
We add all the numbers together, and all the variables
-(+3.0t)+39=0
We get rid of parentheses
-3.0t+39=0
We add all the numbers together, and all the variables
-3t+39=0
We move all terms containing t to the left, all other terms to the right
-3t=-39
t=-39/-3
t=+13
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