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4x+39=9x+9
We move all terms to the left:
4x+39-(9x+9)=0
We get rid of parentheses
4x-9x-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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