Find all whole numbers which:
A: 20-x=x
B: 20-x-6=0
C: x+4=3+x+1
A.
20-x=x change this to 20= x+x
What same two numbers add to 20?
B.
20-x-6=0
Combine like terms 20 and -6
Now you have 14-x=0
Now solve for x
C.
x+4=3+x+1
Combine like terms 3 and 1
x+4=4+x
In this problem the equations are the same. So there are an infinite amount of numbers you could place there.