-2a=a-1

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Solution for -2a=a-1 equation: 



-2a=a-1

We move all terms to the left:

-2a-(a-1)=0

We get rid of parentheses

-2a-a+1=0

We add all the numbers together, and all the variables

-3a+1=0

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

-3a=-1

a=-1/-3

a=1/3

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