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500+20x=100+50x
We move all terms to the left:
500+20x-(100+50x)=0
We add all the numbers together, and all the variables
20x-(50x+100)+500=0
We get rid of parentheses
20x-50x-100+500=0
We add all the numbers together, and all the variables
-30x+400=0
We move all terms containing x to the left, all other terms to the right
-30x=-400
x=-400/-30
x=13+1/3
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