42=-2(-2+a)

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Solution for 42=-2(-2+a) equation: 



42=-2(-2+a)

We move all terms to the left:

42-(-2(-2+a))=0

We add all the numbers together, and all the variables

-(-2(a-2))+42=0



We calculate terms in parentheses: -(-2(a-2)), so:

-2(a-2)

We multiply parentheses

-2a+4

Back to the equation:

-(-2a+4)



We get rid of parentheses

2a-4+42=0

We add all the numbers together, and all the variables

2a+38=0

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

2a=-38

a=-38/2

a=-19

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