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4x-80=2x+300
We move all terms to the left:
4x-80-(2x+300)=0
We get rid of parentheses
4x-2x-300-80=0
We add all the numbers together, and all the variables
2x-380=0
We move all terms containing x to the left, all other terms to the right
2x=380
x=380/2
x=190
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