84=(x-6)+x+3x

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Solution for 84=(x-6)+x+3x equation: 



84=(x-6)+x+3x

We move all terms to the left:

84-((x-6)+x+3x)=0



We calculate terms in parentheses: -((x-6)+x+3x), so:

(x-6)+x+3x

We add all the numbers together, and all the variables

4x+(x-6)

We get rid of parentheses

4x+x-6

We add all the numbers together, and all the variables

5x-6

Back to the equation:

-(5x-6)



We get rid of parentheses

-5x+6+84=0

We add all the numbers together, and all the variables

-5x+90=0

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

-5x=-90

x=-90/-5

x=+18

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