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x+(x+10)+(x+18)=91
We move all terms to the left:
x+(x+10)+(x+18)-(91)=0
We get rid of parentheses
x+x+x+10+18-91=0
We add all the numbers together, and all the variables
3x-63=0
We move all terms containing x to the left, all other terms to the right
3x=63
x=63/3
x=21
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