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-80=-5t-5t
We move all terms to the left:
-80-(-5t-5t)=0
We add all the numbers together, and all the variables
-(-10t)-80=0
We get rid of parentheses
10t-80=0
We move all terms containing t to the left, all other terms to the right
10t=80
t=80/10
t=8
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