(9x+18)=(12x-21)

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Solution for (9x+18)=(12x-21) equation: 



(9x+18)=(12x-21)

We move all terms to the left:

(9x+18)-((12x-21))=0

We get rid of parentheses

9x-((12x-21))+18=0



We calculate terms in parentheses: -((12x-21)), so:

(12x-21)

We get rid of parentheses

12x-21

Back to the equation:

-(12x-21)



We get rid of parentheses

9x-12x+21+18=0

We add all the numbers together, and all the variables

-3x+39=0

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

-3x=-39

x=-39/-3

x=+13

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