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2x+(x+1)+(x+2)=103
We move all terms to the left:
2x+(x+1)+(x+2)-(103)=0
We get rid of parentheses
2x+x+x+1+2-103=0
We add all the numbers together, and all the variables
4x-100=0
We move all terms containing x to the left, all other terms to the right
4x=100
x=100/4
x=25
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