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-3(4x-3)=21
We move all terms to the left:
-3(4x-3)-(21)=0
We multiply parentheses
-12x+9-21=0
We add all the numbers together, and all the variables
-12x-12=0
We move all terms containing x to the left, all other terms to the right
-12x=12
x=12/-12
x=-1
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