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68=-16^2+64t+8
We move all terms to the left:
68-(-16^2+64t+8)=0
We get rid of parentheses
-64t-8+68+16^2=0
We add all the numbers together, and all the variables
-64t+316=0
We move all terms containing t to the left, all other terms to the right
-64t=-316
t=-316/-64
t=4+15/16
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