21x-(-3x+9=)

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Solution for 21x-(-3x+9=) equation: 



21x-(-3x+9=)

We move all terms to the left:

21x-(-3x+9-())=0



We calculate terms in parentheses: -(-3x+9-()), so:

-3x+9-()

We add all the numbers together, and all the variables

-3x

Back to the equation:

-(-3x)



We get rid of parentheses

21x+3x=0

We add all the numbers together, and all the variables

24x=0

x=0/24

x=0

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