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-9t-13=-8t
We move all terms to the left:
-9t-13-(-8t)=0
We get rid of parentheses
-9t+8t-13=0
We add all the numbers together, and all the variables
-1t-13=0
We move all terms containing t to the left, all other terms to the right
-t=13
t=13/-1
t=-13
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