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-3(-x-4)=33
We move all terms to the left:
-3(-x-4)-(33)=0
We add all the numbers together, and all the variables
-3(-1x-4)-33=0
We multiply parentheses
3x+12-33=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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