-138=-6(7-8a)

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Solution for -138=-6(7-8a) equation: 



-138=-6(7-8a)

We move all terms to the left:

-138-(-6(7-8a))=0

We add all the numbers together, and all the variables

-(-6(-8a+7))-138=0



We calculate terms in parentheses: -(-6(-8a+7)), so:

-6(-8a+7)

We multiply parentheses

48a-42

Back to the equation:

-(48a-42)



We get rid of parentheses

-48a+42-138=0

We add all the numbers together, and all the variables

-48a-96=0

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

-48a=96

a=96/-48

a=-2

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