180-3a=6a+9

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Solution for 180-3a=6a+9 equation: 



180-3a=6a+9

We move all terms to the left:

180-3a-(6a+9)=0

We get rid of parentheses

-3a-6a-9+180=0

We add all the numbers together, and all the variables

-9a+171=0

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

-9a=-171

a=-171/-9

a=+19

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