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6(x-9)=9x-42
We move all terms to the left:
6(x-9)-(9x-42)=0
We multiply parentheses
6x-(9x-42)-54=0
We get rid of parentheses
6x-9x+42-54=0
We add all the numbers together, and all the variables
-3x-12=0
We move all terms containing x to the left, all other terms to the right
-3x=12
x=12/-3
x=-4
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