Would you someone tell me that in which step there is a flaw or what's wrong in this...
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if the value of a=b , would hv been substituted
2 : b*b -b²=b²-b²
b²-b²= b²-b²
0=0
and even in situation 3, if we
3: b(b-b)= (a + b)(b - b)
b(0) =(a + b )(0)
0=0