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-11x-21=39-15x
We move all terms to the left:
-11x-21-(39-15x)=0
We add all the numbers together, and all the variables
-11x-(-15x+39)-21=0
We get rid of parentheses
-11x+15x-39-21=0
We add all the numbers together, and all the variables
4x-60=0
We move all terms containing x to the left, all other terms to the right
4x=60
x=60/4
x=15
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