840=8(x+100)

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Solution for 840=8(x+100) equation: 



840=8(x+100)

We move all terms to the left:

840-(8(x+100))=0



We calculate terms in parentheses: -(8(x+100)), so:

8(x+100)

We multiply parentheses

8x+800

Back to the equation:

-(8x+800)



We get rid of parentheses

-8x-800+840=0

We add all the numbers together, and all the variables

-8x+40=0

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

-8x=-40

x=-40/-8

x=+5

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