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x+(x+30)=1000
We move all terms to the left:
x+(x+30)-(1000)=0
We get rid of parentheses
x+x+30-1000=0
We add all the numbers together, and all the variables
2x-970=0
We move all terms containing x to the left, all other terms to the right
2x=970
x=970/2
x=485
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