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40x+100=20x-500
We move all terms to the left:
40x+100-(20x-500)=0
We get rid of parentheses
40x-20x+500+100=0
We add all the numbers together, and all the variables
20x+600=0
We move all terms containing x to the left, all other terms to the right
20x=-600
x=-600/20
x=-30
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