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12=18-t
We move all terms to the left:
12-(18-t)=0
We add all the numbers together, and all the variables
-(-1t+18)+12=0
We get rid of parentheses
1t-18+12=0
We add all the numbers together, and all the variables
t-6=0
We move all terms containing t to the left, all other terms to the right
t=6
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