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x/5=200/50

We move all terms to the left:

x/5-(200/50)=0

We add all the numbers together, and all the variables

x/5-4=0

We multiply all the terms by the denominator

x-4*5=0

We add all the numbers together, and all the variables

x-20=0

We move all terms containing x to the left, all other terms to the right

x=20

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