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21=5+33t-16^2
We move all terms to the left:
21-(5+33t-16^2)=0
We get rid of parentheses
-33t-5+21+16^2=0
We add all the numbers together, and all the variables
-33t+272=0
We move all terms containing t to the left, all other terms to the right
-33t=-272
t=-272/-33
t=8+8/33
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