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400=0.1^2+3t
We move all terms to the left:
400-(0.1^2+3t)=0
We get rid of parentheses
-3t+400-0.1^2=0
We add all the numbers together, and all the variables
-3t+399.99=0
We move all terms containing t to the left, all other terms to the right
-3t=-399.99
t=-399.99/-3
t=133+0.99000000000001/3
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