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3(3-x)=30
We move all terms to the left:
3(3-x)-(30)=0
We add all the numbers together, and all the variables
3(-1x+3)-30=0
We multiply parentheses
-3x+9-30=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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