2a-3a=-a

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Solution for 2a-3a=-a equation: 



2a-3a=-a

We move all terms to the left:

2a-3a-(-a)=0

We add all the numbers together, and all the variables

2a-3a-(-1a)=0

We add all the numbers together, and all the variables

-1a-(-1a)=0

We get rid of parentheses

-1a+1a=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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