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x-20=380-4x
We move all terms to the left:
x-20-(380-4x)=0
We add all the numbers together, and all the variables
x-(-4x+380)-20=0
We get rid of parentheses
x+4x-380-20=0
We add all the numbers together, and all the variables
5x-400=0
We move all terms containing x to the left, all other terms to the right
5x=400
x=400/5
x=80
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