(4x-21)=(7x-21)

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Solution for (4x-21)=(7x-21) equation: 



(4x-21)=(7x-21)

We move all terms to the left:

(4x-21)-((7x-21))=0

We get rid of parentheses

4x-((7x-21))-21=0



We calculate terms in parentheses: -((7x-21)), so:

(7x-21)

We get rid of parentheses

7x-21

Back to the equation:

-(7x-21)



We get rid of parentheses

4x-7x+21-21=0

We add all the numbers together, and all the variables

-3x=0

x=0/-3

x=0

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