-15=a-20

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Solution for -15=a-20 equation: 



-15=a-20

We move all terms to the left:

-15-(a-20)=0

We get rid of parentheses

-a+20-15=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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