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t+6t=9t-42
We move all terms to the left:
t+6t-(9t-42)=0
We add all the numbers together, and all the variables
7t-(9t-42)=0
We get rid of parentheses
7t-9t+42=0
We add all the numbers together, and all the variables
-2t+42=0
We move all terms containing t to the left, all other terms to the right
-2t=-42
t=-42/-2
t=+21
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