Comment soustraire en additionnant

Un grand merci aux abonnés Subbable suivants pour avoir rendu MinutePhysics possible :

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Mark Delcambre (@charkbot)
Lije Carpenter
AdamTheMechE
Principia
Joseph Perry
nowwearealltom
Isabella Clara Archuleta Boyce
David Howard
Nico Houbraken
Gustav Delius

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Collin Mandris
Matt
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Jonathan Piersa
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Chris Barrett
Jan A
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Matt K
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Nick Ward
Kevin
john eriksson
Allan Farrell
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Jon Mann
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J…