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20-x/2=40-x
We move all terms to the left:
20-x/2-(40-x)=0
We add all the numbers together, and all the variables
-x/2-(-1x+40)+20=0
We get rid of parentheses
-x/2+1x-40+20=0
We multiply all the terms by the denominator
-x+1x*2-40*2+20*2=0
We add all the numbers together, and all the variables
-1x+1x*2-40=0
Wy multiply elements
-1x+2x-40=0
We add all the numbers together, and all the variables
x-40=0
We move all terms containing x to the left, all other terms to the right
x=40
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