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x-3(3x+4)=4
We move all terms to the left:
x-3(3x+4)-(4)=0
We multiply parentheses
x-9x-12-4=0
We add all the numbers together, and all the variables
-8x-16=0
We move all terms containing x to the left, all other terms to the right
-8x=16
x=16/-8
x=-2
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