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-9t-8t-(-18t)=-11
We move all terms to the left:
-9t-8t-(-18t)-(-11)=0
We add all the numbers together, and all the variables
-17t-(-18t)+11=0
We get rid of parentheses
-17t+18t+11=0
We add all the numbers together, and all the variables
t+11=0
We move all terms containing t to the left, all other terms to the right
t=-11
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