-63=-9(a-1)

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Solution for -63=-9(a-1) equation: 



-63=-9(a-1)

We move all terms to the left:

-63-(-9(a-1))=0



We calculate terms in parentheses: -(-9(a-1)), so:

-9(a-1)

We multiply parentheses

-9a+9

Back to the equation:

-(-9a+9)



We get rid of parentheses

9a-9-63=0

We add all the numbers together, and all the variables

9a-72=0

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

9a=72

a=72/9

a=8

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