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4(-2)2+8(-2)+3(-2)+6=x
We move all terms to the left:
4(-2)2+8(-2)+3(-2)+6-(x)=0
We add all the numbers together, and all the variables
-1x-32=0
We move all terms containing x to the left, all other terms to the right
-x=32
x=32/-1
x=-32
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