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2(20+x)=64
We move all terms to the left:
2(20+x)-(64)=0
We add all the numbers together, and all the variables
2(x+20)-64=0
We multiply parentheses
2x+40-64=0
We add all the numbers together, and all the variables
2x-24=0
We move all terms containing x to the left, all other terms to the right
2x=24
x=24/2
x=12
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