(4x+21)=(7x-9)

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Solution for (4x+21)=(7x-9) equation: 



(4x+21)=(7x-9)

We move all terms to the left:

(4x+21)-((7x-9))=0

We get rid of parentheses

4x-((7x-9))+21=0



We calculate terms in parentheses: -((7x-9)), so:

(7x-9)

We get rid of parentheses

7x-9

Back to the equation:

-(7x-9)



We get rid of parentheses

4x-7x+9+21=0

We add all the numbers together, and all the variables

-3x+30=0

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

-3x=-30

x=-30/-3

x=+10

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