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4(-2x-5)=8x-20
We move all terms to the left:
4(-2x-5)-(8x-20)=0
We multiply parentheses
-8x-(8x-20)-20=0
We get rid of parentheses
-8x-8x+20-20=0
We add all the numbers together, and all the variables
-16x=0
x=0/-16
x=0
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