84=2.1x

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Solution for 84=2.1x equation: 



84=2.1x

We move all terms to the left:

84-(2.1x)=0

We add all the numbers together, and all the variables

-(+2.1x)+84=0

We get rid of parentheses

-2.1x+84=0

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

-2.1x=-84

x=-84/-2.1

x=+40

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