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7t-89=2t-9
We move all terms to the left:
7t-89-(2t-9)=0
We get rid of parentheses
7t-2t+9-89=0
We add all the numbers together, and all the variables
5t-80=0
We move all terms containing t to the left, all other terms to the right
5t=80
t=80/5
t=16
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