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x+(x+5)+(x+4)=27
We move all terms to the left:
x+(x+5)+(x+4)-(27)=0
We get rid of parentheses
x+x+x+5+4-27=0
We add all the numbers together, and all the variables
3x-18=0
We move all terms containing x to the left, all other terms to the right
3x=18
x=18/3
x=6
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