0=3+a

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Solution for 0=3+a equation: 



0=3+a

We move all terms to the left:

0-(3+a)=0

We add all the numbers together, and all the variables

-(a+3)+0=0

We add all the numbers together, and all the variables

-(a+3)=0

We get rid of parentheses

-a-3=0

We add all the numbers together, and all the variables

-1a-3=0

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

-a=3

a=3/-1

a=-3

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