28=20-2a

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Solution for 28=20-2a equation: 



28=20-2a

We move all terms to the left:

28-(20-2a)=0

We add all the numbers together, and all the variables

-(-2a+20)+28=0

We get rid of parentheses

2a-20+28=0

We add all the numbers together, and all the variables

2a+8=0

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

2a=-8

a=-8/2

a=-4

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