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4x=20x-40
We move all terms to the left:
4x-(20x-40)=0
We get rid of parentheses
4x-20x+40=0
We add all the numbers together, and all the variables
-16x+40=0
We move all terms containing x to the left, all other terms to the right
-16x=-40
x=-40/-16
x=2+1/2
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