3(-9-21)+11=8(a-1)-9

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Solution for 3(-9-21)+11=8(a-1)-9 equation: 



3(-9-21)+11=8(a-1)-9

We move all terms to the left:

3(-9-21)+11-(8(a-1)-9)=0

We add all the numbers together, and all the variables

-(8(a-1)-9)+11+3(-30)=0

We add all the numbers together, and all the variables

-(8(a-1)-9)-79=0



We calculate terms in parentheses: -(8(a-1)-9), so:

8(a-1)-9

We multiply parentheses

8a-8-9

We add all the numbers together, and all the variables

8a-17

Back to the equation:

-(8a-17)



We get rid of parentheses

-8a+17-79=0

We add all the numbers together, and all the variables

-8a-62=0

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

-8a=62

a=62/-8

a=-7+3/4

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