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20+4x=-4(-5-x)
We move all terms to the left:
20+4x-(-4(-5-x))=0
We add all the numbers together, and all the variables
4x-(-4(-1x-5))+20=0
We calculate terms in parentheses: -(-4(-1x-5)), so:We get rid of parentheses
-4(-1x-5)
We multiply parentheses
4x+20
Back to the equation:
-(4x+20)
4x-4x-20+20=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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