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20t-29=8t+7
We move all terms to the left:
20t-29-(8t+7)=0
We get rid of parentheses
20t-8t-7-29=0
We add all the numbers together, and all the variables
12t-36=0
We move all terms containing t to the left, all other terms to the right
12t=36
t=36/12
t=3
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