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20=16t(16t)+84t
We move all terms to the left:
20-(16t(16t)+84t)=0
We add all the numbers together, and all the variables
-(+84t+16t16t)+20=0
We get rid of parentheses
-84t-16t16t+20=0
We move all terms containing t to the left, all other terms to the right
-84t-16t16t=-20
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