-20=-28+4a

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Solution for -20=-28+4a equation: 



-20=-28+4a

We move all terms to the left:

-20-(-28+4a)=0

We add all the numbers together, and all the variables

-(4a-28)-20=0

We get rid of parentheses

-4a+28-20=0

We add all the numbers together, and all the variables

-4a+8=0

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

-4a=-8

a=-8/-4

a=+2

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