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12-(4+-3x)2=8
We move all terms to the left:
12-(4+-3x)2-(8)=0
We add all the numbers together, and all the variables
-(-3x)2+12-8=0
We add all the numbers together, and all the variables
-(-3x)2+4=0
We multiply parentheses
6x+4=0
We move all terms containing x to the left, all other terms to the right
6x=-4
x=-4/6
x=-2/3
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