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20=-5(8x-4)
We move all terms to the left:
20-(-5(8x-4))=0
We calculate terms in parentheses: -(-5(8x-4)), so:We get rid of parentheses
-5(8x-4)
We multiply parentheses
-40x+20
Back to the equation:
-(-40x+20)
40x-20+20=0
We add all the numbers together, and all the variables
40x=0
x=0/40
x=0
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