20x=100(78-x)

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Solution for 20x=100(78-x) equation: 



20x=100(78-x)

We move all terms to the left:

20x-(100(78-x))=0

We add all the numbers together, and all the variables

20x-(100(-1x+78))=0



We calculate terms in parentheses: -(100(-1x+78)), so:

100(-1x+78)

We multiply parentheses

-100x+7800

Back to the equation:

-(-100x+7800)



We get rid of parentheses

20x+100x-7800=0

We add all the numbers together, and all the variables

120x-7800=0

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

120x=7800

x=7800/120

x=65

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