Any maths buffs?

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Brun in reply to @haveo

Wouldn't the colleague's suggestion only be correct if the original was y=a(x+7)?

Disclaimer: I gave up A level maths to do art instead, and that was almost 25 years ago.

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useless in reply to @Brun

Dividing by a first would actually be sensible if you started with y=a(x+7), yes.

You'll still get the right answer for y=ax+7 though, it's just uglier.

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