-21-8a=-1+6+(4-5a)

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Solution for -21-8a=-1+6+(4-5a) equation: 



-21-8a=-1+6+(4-5a)

We move all terms to the left:

-21-8a-(-1+6+(4-5a))=0

We add all the numbers together, and all the variables

-8a-(-1+6+(-5a+4))-21=0



We calculate terms in parentheses: -(-1+6+(-5a+4)), so:

-1+6+(-5a+4)

determiningTheFunctionDomain
(-5a+4)-1+6

We add all the numbers together, and all the variables

(-5a+4)+5

We get rid of parentheses

-5a+4+5

We add all the numbers together, and all the variables

-5a+9

Back to the equation:

-(-5a+9)



We get rid of parentheses

-8a+5a-9-21=0

We add all the numbers together, and all the variables

-3a-30=0

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

-3a=30

a=30/-3

a=-10

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