Which is correct?

Number Theory Level pending

\(\text{1.If a=b we can say:}\)

\(2a=2b\)

\(a-b=b-a\)

\((a-b)^{2}=(b-a)^{2}\)

\(2.If\) \((a-b)^{2}=(b-a)^{2}\\\text{ we can say:}\)

\((a-b)^{2}=(b-a)^{2}\)

\((a-b)=(b-a)\)

\(2a=2b\)

\(a=b\)

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