20=15-5a

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Solution for 20=15-5a equation: 



20=15-5a

We move all terms to the left:

20-(15-5a)=0

We add all the numbers together, and all the variables

-(-5a+15)+20=0

We get rid of parentheses

5a-15+20=0

We add all the numbers together, and all the variables

5a+5=0

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

5a=-5

a=-5/5

a=-1

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