3x=(7x-84)

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Solution for 3x=(7x-84) equation: 



3x=(7x-84)

We move all terms to the left:

3x-((7x-84))=0



We calculate terms in parentheses: -((7x-84)), so:

(7x-84)

We get rid of parentheses

7x-84

Back to the equation:

-(7x-84)



We get rid of parentheses

3x-7x+84=0

We add all the numbers together, and all the variables

-4x+84=0

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

-4x=-84

x=-84/-4

x=+21

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