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-64=-9t+17

We move all terms to the left:

-64-(-9t+17)=0

We get rid of parentheses

9t-17-64=0

We add all the numbers together, and all the variables

9t-81=0

We move all terms containing t to the left, all other terms to the right

9t=81

t=81/9

t=9

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