2a-7=20-a

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Solution for 2a-7=20-a equation: 



2a-7=20-a

We move all terms to the left:

2a-7-(20-a)=0

We add all the numbers together, and all the variables

2a-(-1a+20)-7=0

We get rid of parentheses

2a+1a-20-7=0

We add all the numbers together, and all the variables

3a-27=0

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

3a=27

a=27/3

a=9

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