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