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5(x+2)2=80
We move all terms to the left:
5(x+2)2-(80)=0
We multiply parentheses
10x+20-80=0
We add all the numbers together, and all the variables
10x-60=0
We move all terms containing x to the left, all other terms to the right
10x=60
x=60/10
x=6
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