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50+50+(x+89)=180
We move all terms to the left:
50+50+(x+89)-(180)=0
We add all the numbers together, and all the variables
(x+89)-80=0
We get rid of parentheses
x+89-80=0
We add all the numbers together, and all the variables
x+9=0
We move all terms containing x to the left, all other terms to the right
x=-9
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