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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