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28x=20x-40
We move all terms to the left:
28x-(20x-40)=0
We get rid of parentheses
28x-20x+40=0
We add all the numbers together, and all the variables
8x+40=0
We move all terms containing x to the left, all other terms to the right
8x=-40
x=-40/8
x=-5
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