20=8+a+7

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Solution for 20=8+a+7 equation: 



20=8+a+7

We move all terms to the left:

20-(8+a+7)=0

We add all the numbers together, and all the variables

-(a+15)+20=0

We get rid of parentheses

-a-15+20=0

We add all the numbers together, and all the variables

-1a+5=0

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

-a=-5

a=-5/-1

a=+5

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