3x+4=8x+9-(-21)

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Solution for 3x+4=8x+9-(-21) equation: 



3x+4=8x+9-(-21)

We move all terms to the left:

3x+4-(8x+9-(-21))=0



We calculate terms in parentheses: -(8x+9-(-21)), so:

8x+9-(-21)

We add all the numbers together, and all the variables

8x+30

Back to the equation:

-(8x+30)



We get rid of parentheses

3x-8x-30+4=0

We add all the numbers together, and all the variables

-5x-26=0

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

-5x=26

x=26/-5

x=-5+1/5

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