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39=3t+15
We move all terms to the left:
39-(3t+15)=0
We get rid of parentheses
-3t-15+39=0
We add all the numbers together, and all the variables
-3t+24=0
We move all terms containing t to the left, all other terms to the right
-3t=-24
t=-24/-3
t=+8
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