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-20+13t=9t+16
We move all terms to the left:
-20+13t-(9t+16)=0
We get rid of parentheses
13t-9t-16-20=0
We add all the numbers together, and all the variables
4t-36=0
We move all terms containing t to the left, all other terms to the right
4t=36
t=36/4
t=9
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