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3t-13=-31+t
We move all terms to the left:
3t-13-(-31+t)=0
We add all the numbers together, and all the variables
3t-(t-31)-13=0
We get rid of parentheses
3t-t+31-13=0
We add all the numbers together, and all the variables
2t+18=0
We move all terms containing t to the left, all other terms to the right
2t=-18
t=-18/2
t=-9
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