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9=-t+12
We move all terms to the left:
9-(-t+12)=0
We add all the numbers together, and all the variables
-(-1t+12)+9=0
We get rid of parentheses
1t-12+9=0
We add all the numbers together, and all the variables
t-3=0
We move all terms containing t to the left, all other terms to the right
t=3
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