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8+11t=13t-20
We move all terms to the left:
8+11t-(13t-20)=0
We get rid of parentheses
11t-13t+20+8=0
We add all the numbers together, and all the variables
-2t+28=0
We move all terms containing t to the left, all other terms to the right
-2t=-28
t=-28/-2
t=+14
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