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31=-2t-3t-9
We move all terms to the left:
31-(-2t-3t-9)=0
We add all the numbers together, and all the variables
-(-5t-9)+31=0
We get rid of parentheses
5t+9+31=0
We add all the numbers together, and all the variables
5t+40=0
We move all terms containing t to the left, all other terms to the right
5t=-40
t=-40/5
t=-8
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