20-124=-7a-9(-2+6a)

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Solution for 20-124=-7a-9(-2+6a) equation: 



20-124=-7a-9(-2+6a)

We move all terms to the left:

20-124-(-7a-9(-2+6a))=0

We add all the numbers together, and all the variables

-(-7a-9(6a-2))+20-124=0

We add all the numbers together, and all the variables

-(-7a-9(6a-2))-104=0



We calculate terms in parentheses: -(-7a-9(6a-2)), so:

-7a-9(6a-2)

We multiply parentheses

-7a-54a+18

We add all the numbers together, and all the variables

-61a+18

Back to the equation:

-(-61a+18)



We get rid of parentheses

61a-18-104=0

We add all the numbers together, and all the variables

61a-122=0

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

61a=122

a=122/61

a=2

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