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at 5:00 you simplify the equation incorrectly? because g changes side, hence it should be subtracted rather than being added.
You do fix it at 7:23 when rewriting the equation after substituition
at 5:00 you simplify the equation incorrectly? because g changes side, hence it should be subtracted rather than being added.
You do fix it at 7:23 when rewriting the equation after substituition