-28=-4(-1+a)

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Solution for -28=-4(-1+a) equation: 



-28=-4(-1+a)

We move all terms to the left:

-28-(-4(-1+a))=0

We add all the numbers together, and all the variables

-(-4(a-1))-28=0



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

-4(a-1)

We multiply parentheses

-4a+4

Back to the equation:

-(-4a+4)



We get rid of parentheses

4a-4-28=0

We add all the numbers together, and all the variables

4a-32=0

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

4a=32

a=32/4

a=8

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