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0=-16^2+40t+5
We move all terms to the left:
0-(-16^2+40t+5)=0
We add all the numbers together, and all the variables
-(-16^2+40t+5)=0
We get rid of parentheses
-40t-5+16^2=0
We add all the numbers together, and all the variables
-40t+251=0
We move all terms containing t to the left, all other terms to the right
-40t=-251
t=-251/-40
t=6+11/40
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