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-4(20-x)=48
We move all terms to the left:
-4(20-x)-(48)=0
We add all the numbers together, and all the variables
-4(-1x+20)-48=0
We multiply parentheses
4x-80-48=0
We add all the numbers together, and all the variables
4x-128=0
We move all terms containing x to the left, all other terms to the right
4x=128
x=128/4
x=32
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