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2(x+4)=20=
We move all terms to the left:
2(x+4)-(20)=0
We multiply parentheses
2x+8-20=0
We add all the numbers together, and all the variables
2x-12=0
We move all terms containing x to the left, all other terms to the right
2x=12
x=12/2
x=6
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