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42+5t-42=8t-42
We move all terms to the left:
42+5t-42-(8t-42)=0
We add all the numbers together, and all the variables
5t-(8t-42)=0
We get rid of parentheses
5t-8t+42=0
We add all the numbers together, and all the variables
-3t+42=0
We move all terms containing t to the left, all other terms to the right
-3t=-42
t=-42/-3
t=+14
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