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90=9t+9
We move all terms to the left:
90-(9t+9)=0
We get rid of parentheses
-9t-9+90=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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