40-6a=-4(7-7a)

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Solution for 40-6a=-4(7-7a) equation: 



40-6a=-4(7-7a)

We move all terms to the left:

40-6a-(-4(7-7a))=0

We add all the numbers together, and all the variables

-6a-(-4(-7a+7))+40=0



We calculate terms in parentheses: -(-4(-7a+7)), so:

-4(-7a+7)

We multiply parentheses

28a-28

Back to the equation:

-(28a-28)



We get rid of parentheses

-6a-28a+28+40=0

We add all the numbers together, and all the variables

-34a+68=0

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

-34a=-68

a=-68/-34

a=+2

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