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-0.85t-3.9=8.15
We move all terms to the left:
-0.85t-3.9-(8.15)=0
We add all the numbers together, and all the variables
-0.85t-12.05=0
We move all terms containing t to the left, all other terms to the right
-0.85t=12.05
t=12.05/-0.85
t=-14+0.15/0.85
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