840(2)=x

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Solution for 840(2)=x equation: 



840(2)=x

We move all terms to the left:

840(2)-(x)=0

We add all the numbers together, and all the variables

-1x+8402=0

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

-x=-8402

x=-8402/-1

x=+8402

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