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200=40+20x
We move all terms to the left:
200-(40+20x)=0
We add all the numbers together, and all the variables
-(20x+40)+200=0
We get rid of parentheses
-20x-40+200=0
We add all the numbers together, and all the variables
-20x+160=0
We move all terms containing x to the left, all other terms to the right
-20x=-160
x=-160/-20
x=+8
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