30=-10(9+a)

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Solution for 30=-10(9+a) equation: 



30=-10(9+a)

We move all terms to the left:

30-(-10(9+a))=0

We add all the numbers together, and all the variables

-(-10(a+9))+30=0



We calculate terms in parentheses: -(-10(a+9)), so:

-10(a+9)

We multiply parentheses

-10a-90

Back to the equation:

-(-10a-90)



We get rid of parentheses

10a+90+30=0

We add all the numbers together, and all the variables

10a+120=0

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

10a=-120

a=-120/10

a=-12

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