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84=18+t
We move all terms to the left:
84-(18+t)=0
We add all the numbers together, and all the variables
-(t+18)+84=0
We get rid of parentheses
-t-18+84=0
We add all the numbers together, and all the variables
-1t+66=0
We move all terms containing t to the left, all other terms to the right
-t=-66
t=-66/-1
t=+66
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