Here goes...
Assume that a=b
Therefore, a+a=a+b
Which can be simplified to 2a=a+b
Subtract 2b from both sides, like this: 2a-2b=a+b-2b
Redistribute the left and subtract the right and yield 2(a-b)=a-b
Divide by (a-b), which is zero in this equation, and the result is...
2=1
What now, an earthquake?