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-13=-1+3t
We move all terms to the left:
-13-(-1+3t)=0
We add all the numbers together, and all the variables
-(3t-1)-13=0
We get rid of parentheses
-3t+1-13=0
We add all the numbers together, and all the variables
-3t-12=0
We move all terms containing t to the left, all other terms to the right
-3t=12
t=12/-3
t=-4
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