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5x-(3x+9)=8x-39
We move all terms to the left:
5x-(3x+9)-(8x-39)=0
We get rid of parentheses
5x-3x-8x-9+39=0
We add all the numbers together, and all the variables
-6x+30=0
We move all terms containing x to the left, all other terms to the right
-6x=-30
x=-30/-6
x=+5
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