12=1-3a+8

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Solution for 12=1-3a+8 equation: 



12=1-3a+8

We move all terms to the left:

12-(1-3a+8)=0

We add all the numbers together, and all the variables

-(-3a+9)+12=0

We get rid of parentheses

3a-9+12=0

We add all the numbers together, and all the variables

3a+3=0

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

3a=-3

a=-3/3

a=-1

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