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(X/2-21)+X=180
We move all terms to the left:
(X/2-21)+X-(180)=0
We add all the numbers together, and all the variables
X+(X/2-21)-180=0
We get rid of parentheses
X+X/2-21-180=0
We multiply all the terms by the denominator
X*2+X-21*2-180*2=0
We add all the numbers together, and all the variables
X+X*2-402=0
Wy multiply elements
X+2X-402=0
We add all the numbers together, and all the variables
3X-402=0
We move all terms containing X to the left, all other terms to the right
3X=402
X=402/3
X=134
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