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13=12-5t
We move all terms to the left:
13-(12-5t)=0
We add all the numbers together, and all the variables
-(-5t+12)+13=0
We get rid of parentheses
5t-12+13=0
We add all the numbers together, and all the variables
5t+1=0
We move all terms containing t to the left, all other terms to the right
5t=-1
t=-1/5
t=-1/5
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