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t+9=-9-2t
We move all terms to the left:
t+9-(-9-2t)=0
We add all the numbers together, and all the variables
t-(-2t-9)+9=0
We get rid of parentheses
t+2t+9+9=0
We add all the numbers together, and all the variables
3t+18=0
We move all terms containing t to the left, all other terms to the right
3t=-18
t=-18/3
t=-6
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