-63=-7(a-9)

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Solution for -63=-7(a-9) equation: 



-63=-7(a-9)

We move all terms to the left:

-63-(-7(a-9))=0



We calculate terms in parentheses: -(-7(a-9)), so:

-7(a-9)

We multiply parentheses

-7a+63

Back to the equation:

-(-7a+63)



We get rid of parentheses

7a-63-63=0

We add all the numbers together, and all the variables

7a-126=0

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

7a=126

a=126/7

a=18

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