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200=20+9x
We move all terms to the left:
200-(20+9x)=0
We add all the numbers together, and all the variables
-(9x+20)+200=0
We get rid of parentheses
-9x-20+200=0
We add all the numbers together, and all the variables
-9x+180=0
We move all terms containing x to the left, all other terms to the right
-9x=-180
x=-180/-9
x=+20
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