-138=6(7+5a)

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Solution for -138=6(7+5a) equation: 



-138=6(7+5a)

We move all terms to the left:

-138-(6(7+5a))=0

We add all the numbers together, and all the variables

-(6(5a+7))-138=0



We calculate terms in parentheses: -(6(5a+7)), so:

6(5a+7)

We multiply parentheses

30a+42

Back to the equation:

-(30a+42)



We get rid of parentheses

-30a-42-138=0

We add all the numbers together, and all the variables

-30a-180=0

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

-30a=180

a=180/-30

a=-6

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