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(x+8)^3/2=343
We move all terms to the left:
(x+8)^3/2-(343)=0
We multiply all the terms by the denominator
(x+8)^3-343*2=0
We add all the numbers together, and all the variables
(x+8)^3-686=0
We move all terms containing x to the left, all other terms to the right
(x+8)^3=686
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