9+21=-3(7x-10)

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Solution for 9+21=-3(7x-10) equation: 



9+21=-3(7x-10)

We move all terms to the left:

9+21-(-3(7x-10))=0

We add all the numbers together, and all the variables

-(-3(7x-10))+30=0



We calculate terms in parentheses: -(-3(7x-10)), so:

-3(7x-10)

We multiply parentheses

-21x+30

Back to the equation:

-(-21x+30)



We get rid of parentheses

21x-30+30=0

We add all the numbers together, and all the variables

21x=0

x=0/21

x=0

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