Marshmallow
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Same old trick: Doing some thing which is not permissible in mathematics then come with Surprises.
1.)Dividing with ZERO is not permissible e.g. last problem of a=2a
2.)Taking root of a negative number is not permissible.e.g. root of -1 is UNDEFINED so 3rd step is wrong.
Jarha r u a Math Teacher?