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39-9x=21-3x
We move all terms to the left:
39-9x-(21-3x)=0
We add all the numbers together, and all the variables
-9x-(-3x+21)+39=0
We get rid of parentheses
-9x+3x-21+39=0
We add all the numbers together, and all the variables
-6x+18=0
We move all terms containing x to the left, all other terms to the right
-6x=-18
x=-18/-6
x=+3
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