4=-3.9+a

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Solution for 4=-3.9+a equation: 



4=-3.9+a

We move all terms to the left:

4-(-3.9+a)=0

We add all the numbers together, and all the variables

-(a-3.9)+4=0

We get rid of parentheses

-a+3.9+4=0

We add all the numbers together, and all the variables

-1a+7.9=0

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

-a=-7.9

a=-7.9/-1

a=7+0.9/1

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