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maths complex numbers

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Can abs(28-7w)=7abs(w)
be written as abs(w-4)=abs(w)
and if so why surely it should be
can any one explain why I can just chane the signs

Yes, it can be written that way.

I don't see that you have changed any signs, you factored a postive seven out of both sides, and divided it out.


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