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2(x+20)=x+30
We move all terms to the left:
2(x+20)-(x+30)=0
We multiply parentheses
2x-(x+30)+40=0
We get rid of parentheses
2x-x-30+40=0
We add all the numbers together, and all the variables
x+10=0
We move all terms containing x to the left, all other terms to the right
x=-10
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