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-9t=8.1
We move all terms to the left:
-9t-(8.1)=0
We add all the numbers together, and all the variables
-9t-8.1=0
We move all terms containing t to the left, all other terms to the right
-9t=8.1
t=8.1/-9
t=-7.3636363636364/8.1818181818182
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