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2x-(5+x)=20
We move all terms to the left:
2x-(5+x)-(20)=0
We add all the numbers together, and all the variables
2x-(x+5)-20=0
We get rid of parentheses
2x-x-5-20=0
We add all the numbers together, and all the variables
x-25=0
We move all terms containing x to the left, all other terms to the right
x=25
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