20x=5(100-x)

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Solution for 20x=5(100-x) equation: 



20x=5(100-x)

We move all terms to the left:

20x-(5(100-x))=0

We add all the numbers together, and all the variables

20x-(5(-1x+100))=0



We calculate terms in parentheses: -(5(-1x+100)), so:

5(-1x+100)

We multiply parentheses

-5x+500

Back to the equation:

-(-5x+500)



We get rid of parentheses

20x+5x-500=0

We add all the numbers together, and all the variables

25x-500=0

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

25x=500

x=500/25

x=20

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