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x/2-1=20-10x
We move all terms to the left:
x/2-1-(20-10x)=0
We add all the numbers together, and all the variables
x/2-(-10x+20)-1=0
We get rid of parentheses
x/2+10x-20-1=0
We multiply all the terms by the denominator
x+10x*2-20*2-1*2=0
We add all the numbers together, and all the variables
x+10x*2-42=0
Wy multiply elements
x+20x-42=0
We add all the numbers together, and all the variables
21x-42=0
We move all terms containing x to the left, all other terms to the right
21x=42
x=42/21
x=2
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