54=-9(a-7)

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Solution for 54=-9(a-7) equation: 



54=-9(a-7)

We move all terms to the left:

54-(-9(a-7))=0



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

-9(a-7)

We multiply parentheses

-9a+63

Back to the equation:

-(-9a+63)



We get rid of parentheses

9a-63+54=0

We add all the numbers together, and all the variables

9a-9=0

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

9a=9

a=9/9

a=1

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