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21=11+6x
We move all terms to the left:
21-(11+6x)=0
We add all the numbers together, and all the variables
-(6x+11)+21=0
We get rid of parentheses
-6x-11+21=0
We add all the numbers together, and all the variables
-6x+10=0
We move all terms containing x to the left, all other terms to the right
-6x=-10
x=-10/-6
x=1+2/3
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