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13=12t-18
We move all terms to the left:
13-(12t-18)=0
We get rid of parentheses
-12t+18+13=0
We add all the numbers together, and all the variables
-12t+31=0
We move all terms containing t to the left, all other terms to the right
-12t=-31
t=-31/-12
t=2+7/12
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