a=a(-7)

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Solution for a=a(-7) equation: 



a=a(-7)

We move all terms to the left:

a-(a(-7))=0



We calculate terms in parentheses: -(a(-7)), so:

a(-7)

We multiply parentheses

-7a

Back to the equation:

-(-7a)



We get rid of parentheses

a+7a=0

We add all the numbers together, and all the variables

8a=0

a=0/8

a=0

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