12-20a=8-9a

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Solution for 12-20a=8-9a equation: 



12-20a=8-9a

We move all terms to the left:

12-20a-(8-9a)=0

We add all the numbers together, and all the variables

-20a-(-9a+8)+12=0

We get rid of parentheses

-20a+9a-8+12=0

We add all the numbers together, and all the variables

-11a+4=0

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

-11a=-4

a=-4/-11

a=4/11

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