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-16-8t+5t=t+20

We move all terms to the left:

-16-8t+5t-(t+20)=0

We add all the numbers together, and all the variables

-3t-(t+20)-16=0

We get rid of parentheses

-3t-t-20-16=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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