7=9-2a

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Solution for 7=9-2a equation: 



7=9-2a

We move all terms to the left:

7-(9-2a)=0

We add all the numbers together, and all the variables

-(-2a+9)+7=0

We get rid of parentheses

2a-9+7=0

We add all the numbers together, and all the variables

2a-2=0

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

2a=2

a=2/2

a=1

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