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-4x-1=2x+20
We move all terms to the left:
-4x-1-(2x+20)=0
We get rid of parentheses
-4x-2x-20-1=0
We add all the numbers together, and all the variables
-6x-21=0
We move all terms containing x to the left, all other terms to the right
-6x=21
x=21/-6
x=-3+1/2
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