Mysterious Maths !!??

I,m gonna prove 2=3..

-6 = -6

-10 + 4 = -15 + 9

Now, adding 25/4 on both sides,

25/4-10+4 = 25/4-15+9

(5/2 -2) 2= (5/2-3)2 { (a+b)2 =a2+b2+2ab } { 2 here is square }

Now, taking root on both sides , we get

-2 = -3

Hence proved 2 = 3 How is That ??.........