-31=-4(2a+9)

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Solution for -31=-4(2a+9) equation: 



-31=-4(2a+9)

We move all terms to the left:

-31-(-4(2a+9))=0



We calculate terms in parentheses: -(-4(2a+9)), so:

-4(2a+9)

We multiply parentheses

-8a-36

Back to the equation:

-(-8a-36)



We get rid of parentheses

8a+36-31=0

We add all the numbers together, and all the variables

8a+5=0

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

8a=-5

a=-5/8

a=-5/8

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