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6x+39=3x+21
We move all terms to the left:
6x+39-(3x+21)=0
We get rid of parentheses
6x-3x-21+39=0
We add all the numbers together, and all the variables
3x+18=0
We move all terms containing x to the left, all other terms to the right
3x=-18
x=-18/3
x=-6
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