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13=10-t
We move all terms to the left:
13-(10-t)=0
We add all the numbers together, and all the variables
-(-1t+10)+13=0
We get rid of parentheses
1t-10+13=0
We add all the numbers together, and all the variables
t+3=0
We move all terms containing t to the left, all other terms to the right
t=-3
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