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(2x-21)+(x+1)+x=180
We move all terms to the left:
(2x-21)+(x+1)+x-(180)=0
We add all the numbers together, and all the variables
x+(2x-21)+(x+1)-180=0
We get rid of parentheses
x+2x+x-21+1-180=0
We add all the numbers together, and all the variables
4x-200=0
We move all terms containing x to the left, all other terms to the right
4x=200
x=200/4
x=50
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