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67.9=8t+11.9
We move all terms to the left:
67.9-(8t+11.9)=0
We get rid of parentheses
-8t-11.9+67.9=0
We add all the numbers together, and all the variables
-8t+56=0
We move all terms containing t to the left, all other terms to the right
-8t=-56
t=-56/-8
t=+7
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