99=2(a+2a)+9

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Solution for 99=2(a+2a)+9 equation: 



99=2(a+2a)+9

We move all terms to the left:

99-(2(a+2a)+9)=0

We add all the numbers together, and all the variables

-(2(+3a)+9)+99=0



We calculate terms in parentheses: -(2(+3a)+9), so:

2(+3a)+9

We multiply parentheses

6a+9

Back to the equation:

-(6a+9)



We get rid of parentheses

-6a-9+99=0

We add all the numbers together, and all the variables

-6a+90=0

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

-6a=-90

a=-90/-6

a=+15

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