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2t=39-t
We move all terms to the left:
2t-(39-t)=0
We add all the numbers together, and all the variables
2t-(-1t+39)=0
We get rid of parentheses
2t+1t-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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