20-30=a+12

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Solution for 20-30=a+12 equation: 



20-30=a+12

We move all terms to the left:

20-30-(a+12)=0

We add all the numbers together, and all the variables

-(a+12)-10=0

We get rid of parentheses

-a-12-10=0

We add all the numbers together, and all the variables

-1a-22=0

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

-a=22

a=22/-1

a=-22

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