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x+(x+23)=89
We move all terms to the left:
x+(x+23)-(89)=0
We get rid of parentheses
x+x+23-89=0
We add all the numbers together, and all the variables
2x-66=0
We move all terms containing x to the left, all other terms to the right
2x=66
x=66/2
x=33
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