3a-7a=-4a

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Solution for 3a-7a=-4a equation: 



3a-7a=-4a

We move all terms to the left:

3a-7a-(-4a)=0

We add all the numbers together, and all the variables

-4a-(-4a)=0

We get rid of parentheses

-4a+4a=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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