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x=20-x-1-x-3
We move all terms to the left:
x-(20-x-1-x-3)=0
We add all the numbers together, and all the variables
x-(-2x+16)=0
We get rid of parentheses
x+2x-16=0
We add all the numbers together, and all the variables
3x-16=0
We move all terms containing x to the left, all other terms to the right
3x=16
x=16/3
x=5+1/3
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