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-6x-39=6x+15
We move all terms to the left:
-6x-39-(6x+15)=0
We get rid of parentheses
-6x-6x-15-39=0
We add all the numbers together, and all the variables
-12x-54=0
We move all terms containing x to the left, all other terms to the right
-12x=54
x=54/-12
x=-4+1/2
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