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(x+19)+(x+1)+x=68
We move all terms to the left:
(x+19)+(x+1)+x-(68)=0
We add all the numbers together, and all the variables
x+(x+19)+(x+1)-68=0
We get rid of parentheses
x+x+x+19+1-68=0
We add all the numbers together, and all the variables
3x-48=0
We move all terms containing x to the left, all other terms to the right
3x=48
x=48/3
x=16
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