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57=13+-9t
We move all terms to the left:
57-(13+-9t)=0
We add all the numbers together, and all the variables
-(-9t)+57=0
We get rid of parentheses
9t+57=0
We move all terms containing t to the left, all other terms to the right
9t=-57
t=-57/9
t=-6+1/3
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