27=7a-9a

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Solution for 27=7a-9a equation: 



27=7a-9a

We move all terms to the left:

27-(7a-9a)=0

We add all the numbers together, and all the variables

-(-2a)+27=0

We get rid of parentheses

2a+27=0

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

2a=-27

a=-27/2

a=-13+1/2

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