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13t-15=11t-11
We move all terms to the left:
13t-15-(11t-11)=0
We get rid of parentheses
13t-11t+11-15=0
We add all the numbers together, and all the variables
2t-4=0
We move all terms containing t to the left, all other terms to the right
2t=4
t=4/2
t=2
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