Proof? ;-)

A golden oldie...:

Suppose:

a + b = c.

This can then be equivalently written as:

(4a – 3a) + (4b – 3b) = 4c – 3c

After reorganizing (adding/subtracting from both sides):

4a + 4b – 4c = 3a + 3b – 3c

Take the constants out of the brackets:

4(a + b – c) = 3(a + b – c)

Remove the same term left and right:

4 = 3

Ta-daaaaaaa!!