(4x-9)=(5x-21)

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Solution for (4x-9)=(5x-21) equation: 



(4x-9)=(5x-21)

We move all terms to the left:

(4x-9)-((5x-21))=0

We get rid of parentheses

4x-((5x-21))-9=0



We calculate terms in parentheses: -((5x-21)), so:

(5x-21)

We get rid of parentheses

5x-21

Back to the equation:

-(5x-21)



We get rid of parentheses

4x-5x+21-9=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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