Three is equal to four

Theorem: 3=4
Proof:

Suppose:
a + b = c

This can also be written as:
4a – 3a + 4b – 3b = 4c – 3c

After reorganizing:
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