-1=1-a+2

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Solution for -1=1-a+2 equation: 



-1=1-a+2

We move all terms to the left:

-1-(1-a+2)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1a-3-1=0

We add all the numbers together, and all the variables

a-4=0

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

a=4

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