7=9-4a

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Solution for 7=9-4a equation: 



7=9-4a

We move all terms to the left:

7-(9-4a)=0

We add all the numbers together, and all the variables

-(-4a+9)+7=0

We get rid of parentheses

4a-9+7=0

We add all the numbers together, and all the variables

4a-2=0

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

4a=2

a=2/4

a=1/2

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