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(2x+1)2=16
We move all terms to the left:
(2x+1)2-(16)=0
We multiply parentheses
4x+2-16=0
We add all the numbers together, and all the variables
4x-14=0
We move all terms containing x to the left, all other terms to the right
4x=14
x=14/4
x=3+1/2
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