3=a-1+a

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Solution for 3=a-1+a equation: 



3=a-1+a

We move all terms to the left:

3-(a-1+a)=0

We add all the numbers together, and all the variables

-(2a-1)+3=0

We get rid of parentheses

-2a+1+3=0

We add all the numbers together, and all the variables

-2a+4=0

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

-2a=-4

a=-4/-2

a=+2

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