Three Equals Four

Theorem:
3 = 4
Suppose: 
a+b = c
This can be written as: 
4a - 3a + 4b - 3b = 4c - 3c
After reorganizing:
4a + 4b + 4c = 3a+ 3b + 3c
Take the constants into brackets:
4 (a+b+c) = 3 (a+b+c)
Remove like terms from left and right:
4 = 3