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-4(2x+1)=20
We move all terms to the left:
-4(2x+1)-(20)=0
We multiply parentheses
-8x-4-20=0
We add all the numbers together, and all the variables
-8x-24=0
We move all terms containing x to the left, all other terms to the right
-8x=24
x=24/-8
x=-3
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