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-8-4x=-20-8x
We move all terms to the left:
-8-4x-(-20-8x)=0
We add all the numbers together, and all the variables
-4x-(-8x-20)-8=0
We get rid of parentheses
-4x+8x+20-8=0
We add all the numbers together, and all the variables
4x+12=0
We move all terms containing x to the left, all other terms to the right
4x=-12
x=-12/4
x=-3
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