3=2a-(-7)a

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Solution for 3=2a-(-7)a equation: 



3=2a-(-7)a

We move all terms to the left:

3-(2a-(-7)a)=0



We calculate terms in parentheses: -(2a-(-7)a), so:

2a-(-7)a

We multiply parentheses

2a+7a

We add all the numbers together, and all the variables

9a

Back to the equation:

-(9a)



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

-9a=-3

a=-3/-9

a=1/3

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