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27=21+x
We move all terms to the left:
27-(21+x)=0
We add all the numbers together, and all the variables
-(x+21)+27=0
We get rid of parentheses
-x-21+27=0
We add all the numbers together, and all the variables
-1x+6=0
We move all terms containing x to the left, all other terms to the right
-x=-6
x=-6/-1
x=+6
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