240=840(1-x)

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Solution for 240=840(1-x) equation: 



240=840(1-x)

We move all terms to the left:

240-(840(1-x))=0

We add all the numbers together, and all the variables

-(840(-1x+1))+240=0



We calculate terms in parentheses: -(840(-1x+1)), so:

840(-1x+1)

We multiply parentheses

-840x+840

Back to the equation:

-(-840x+840)



We get rid of parentheses

840x-840+240=0

We add all the numbers together, and all the variables

840x-600=0

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

840x=600

x=600/840

x=5/7

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