a+18-2a+9=12+a

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Solution for a+18-2a+9=12+a equation: 



a+18-2a+9=12+a

We move all terms to the left:

a+18-2a+9-(12+a)=0

We add all the numbers together, and all the variables

a-2a-(a+12)+18+9=0

We add all the numbers together, and all the variables

-1a-(a+12)+27=0

We get rid of parentheses

-1a-a-12+27=0

We add all the numbers together, and all the variables

-2a+15=0

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

-2a=-15

a=-15/-2

a=7+1/2

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