3+21=-3(7x-8)

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Solution for 3+21=-3(7x-8) equation: 



3+21=-3(7x-8)

We move all terms to the left:

3+21-(-3(7x-8))=0

We add all the numbers together, and all the variables

-(-3(7x-8))+24=0



We calculate terms in parentheses: -(-3(7x-8)), so:

-3(7x-8)

We multiply parentheses

-21x+24

Back to the equation:

-(-21x+24)



We get rid of parentheses

21x-24+24=0

We add all the numbers together, and all the variables

21x=0

x=0/21

x=0

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