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x+(x-1)+(x+2)=219
We move all terms to the left:
x+(x-1)+(x+2)-(219)=0
We get rid of parentheses
x+x+x-1+2-219=0
We add all the numbers together, and all the variables
3x-218=0
We move all terms containing x to the left, all other terms to the right
3x=218
x=218/3
x=72+2/3
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