-5=a+15

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Solution for -5=a+15 equation: 



-5=a+15

We move all terms to the left:

-5-(a+15)=0

We get rid of parentheses

-a-15-5=0

We add all the numbers together, and all the variables

-1a-20=0

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

-a=20

a=20/-1

a=-20

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