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-4(x-20.75)=-1
We move all terms to the left:
-4(x-20.75)-(-1)=0
We add all the numbers together, and all the variables
-4(x-20.75)+1=0
We multiply parentheses
-4x+83+1=0
We add all the numbers together, and all the variables
-4x+84=0
We move all terms containing x to the left, all other terms to the right
-4x=-84
x=-84/-4
x=+21
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