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-100=-5(4x-4)
We move all terms to the left:
-100-(-5(4x-4))=0
We calculate terms in parentheses: -(-5(4x-4)), so:We get rid of parentheses
-5(4x-4)
We multiply parentheses
-20x+20
Back to the equation:
-(-20x+20)
20x-20-100=0
We add all the numbers together, and all the variables
20x-120=0
We move all terms containing x to the left, all other terms to the right
20x=120
x=120/20
x=6
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