9(8a-9a)+9a-9(99a-55a)+78a=99

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Solution for 9(8a-9a)+9a-9(99a-55a)+78a=99 equation: 



9(8a-9a)+9a-9(99a-55a)+78a=99

We move all terms to the left:

9(8a-9a)+9a-9(99a-55a)+78a-(99)=0

We add all the numbers together, and all the variables

9(-1a)+9a-9(+44a)+78a-99=0

We add all the numbers together, and all the variables

87a+9(-1a)-9(+44a)-99=0

We multiply parentheses

87a-9a-396a-99=0

We add all the numbers together, and all the variables

-318a-99=0

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

-318a=99

a=99/-318

a=-33/106

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