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## Homework Statement

The problem is a

^{2}+b

^{2}+c

^{2}=2(a-b-c)-3

Find a+b+c

## Homework Equations

none

## The Attempt at a Solution

well i tried to add 2(ab+ac+cb) to make the a

^{2}+b

^{2}+c

^{2}=(a+b+c) 2

so the other side also has a 2(ab+ac+cb)

:. it becomes( if brackets are opened)

2a-2b-2c+2ab+2ac+2cb-2-1

=2a+2ab+2ac-2b-2c-2+2cb-1

=2a(1+b+c)-2(1+b+c) +2cb-1

= (1+b+c)(2a-2)+2cb-1

Hey i even close to any proper solution

Plz help me out!