3a=-9a+7a

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Solution for 3a=-9a+7a equation: 



3a=-9a+7a

We move all terms to the left:

3a-(-9a+7a)=0

We add all the numbers together, and all the variables

3a-(-2a)=0

We get rid of parentheses

3a+2a=0

We add all the numbers together, and all the variables

5a=0

a=0/5

a=0

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