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x/2=21-x
We move all terms to the left:
x/2-(21-x)=0
We add all the numbers together, and all the variables
x/2-(-1x+21)=0
We get rid of parentheses
x/2+1x-21=0
We multiply all the terms by the denominator
x+1x*2-21*2=0
We add all the numbers together, and all the variables
x+1x*2-42=0
Wy multiply elements
x+2x-42=0
We add all the numbers together, and all the variables
3x-42=0
We move all terms containing x to the left, all other terms to the right
3x=42
x=42/3
x=14
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