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(x+30)+x+80=1800
We move all terms to the left:
(x+30)+x+80-(1800)=0
We add all the numbers together, and all the variables
x+(x+30)-1720=0
We get rid of parentheses
x+x+30-1720=0
We add all the numbers together, and all the variables
2x-1690=0
We move all terms containing x to the left, all other terms to the right
2x=1690
x=1690/2
x=845
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