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9-3(2x-1)=30
We move all terms to the left:
9-3(2x-1)-(30)=0
We add all the numbers together, and all the variables
-3(2x-1)-21=0
We multiply parentheses
-6x+3-21=0
We add all the numbers together, and all the variables
-6x-18=0
We move all terms containing x to the left, all other terms to the right
-6x=18
x=18/-6
x=-3
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