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85=9t+4
We move all terms to the left:
85-(9t+4)=0
We get rid of parentheses
-9t-4+85=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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