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21+200=11x-10
We move all terms to the left:
21+200-(11x-10)=0
We add all the numbers together, and all the variables
-(11x-10)+221=0
We get rid of parentheses
-11x+10+221=0
We add all the numbers together, and all the variables
-11x+231=0
We move all terms containing x to the left, all other terms to the right
-11x=-231
x=-231/-11
x=+21
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