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6(x-9)=3x+30
We move all terms to the left:
6(x-9)-(3x+30)=0
We multiply parentheses
6x-(3x+30)-54=0
We get rid of parentheses
6x-3x-30-54=0
We add all the numbers together, and all the variables
3x-84=0
We move all terms containing x to the left, all other terms to the right
3x=84
x=84/3
x=28
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