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70=-16.4^2+80t
We move all terms to the left:
70-(-16.4^2+80t)=0
We get rid of parentheses
-80t+70+16.4^2=0
We add all the numbers together, and all the variables
-80t+338.96=0
We move all terms containing t to the left, all other terms to the right
-80t=-338.96
t=-338.96/-80
t=4+6.40540540541/27.027027027
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