Here you go...

Proof that 1 = 2:

Step 1: Let a = b.
Step 2: Then aa = ab.
Step 3: aa + aa = aa + ab.
Step 4: 2(aa) = aa + ab.
Step 5: 2(aa) - 2ab = aa + ab - 2ab.
Step 6: and 2(aa) - 2ab = aa - ab.
Step 7: This can be written as 2(aa - ab) = 1(aa - ab).
Step 8: and cancelling the (aa - ab) from both sides gives 1=2.