Answer:
2
Step-by-step explanation:
In algebra, you can replace the letters in an equation with whatever number they equal.
So because a = 2, we can replace the a in this formula with the number 2
We can do the same thing for the rest of these letters!
so...
a + b + c
becomes
2 + 1 + (-1)
now all we need to do is solve :)
2 + 1 + (-1)
3 + (-1)
3 - 1
2
