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Calculating standard cell potentials

I understand that Ecell=oxidation potential+reduction potential and that oxidation potential=-reduction potential but I don't get the correct answers when I use these two.

For example the cell: Zn/Zn2+ // Ag+/Ag
The answer is +0.80 + +0.76 and I don't understand why that is.
Zn/Zn2+ has a REDUCTION potential of -0.76V.
Ag+/Ag has a REDUCTION potential of +0.80V.
Zn/Zn2+ is on the LHS so its reduction potential is to be taken. Its reduction potential is -0.76. Why've they taken +0.76V??? Same for Ag+/Ag - its oxidation potential should be taken since it's on the RHS but they've taken its reduction potential... WHY?

Also is there a difference between Zn/Zn2+ and Zn2+/Zn? Does the first mean oxidation and the 2nd reduction? Thanks.