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-4x-21=39-9x
We move all terms to the left:
-4x-21-(39-9x)=0
We add all the numbers together, and all the variables
-4x-(-9x+39)-21=0
We get rid of parentheses
-4x+9x-39-21=0
We add all the numbers together, and all the variables
5x-60=0
We move all terms containing x to the left, all other terms to the right
5x=60
x=60/5
x=12
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