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6(x+3)=9x+39
We move all terms to the left:
6(x+3)-(9x+39)=0
We multiply parentheses
6x-(9x+39)+18=0
We get rid of parentheses
6x-9x-39+18=0
We add all the numbers together, and all the variables
-3x-21=0
We move all terms containing x to the left, all other terms to the right
-3x=21
x=21/-3
x=-7
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