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20=3t-20t
We move all terms to the left:
20-(3t-20t)=0
We add all the numbers together, and all the variables
-(-17t)+20=0
We get rid of parentheses
17t+20=0
We move all terms containing t to the left, all other terms to the right
17t=-20
t=-20/17
t=-1+3/17
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