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39-5x=-10x+9
We move all terms to the left:
39-5x-(-10x+9)=0
We get rid of parentheses
-5x+10x-9+39=0
We add all the numbers together, and all the variables
5x+30=0
We move all terms containing x to the left, all other terms to the right
5x=-30
x=-30/5
x=-6
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