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x-6=21+4x
We move all terms to the left:
x-6-(21+4x)=0
We add all the numbers together, and all the variables
x-(4x+21)-6=0
We get rid of parentheses
x-4x-21-6=0
We add all the numbers together, and all the variables
-3x-27=0
We move all terms containing x to the left, all other terms to the right
-3x=27
x=27/-3
x=-9
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