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64=-4x-2(-4x-20)
We move all terms to the left:
64-(-4x-2(-4x-20))=0
We calculate terms in parentheses: -(-4x-2(-4x-20)), so:We get rid of parentheses
-4x-2(-4x-20)
We multiply parentheses
-4x+8x+40
We add all the numbers together, and all the variables
4x+40
Back to the equation:
-(4x+40)
-4x-40+64=0
We add all the numbers together, and all the variables
-4x+24=0
We move all terms containing x to the left, all other terms to the right
-4x=-24
x=-24/-4
x=+6
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