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So I made a code: Subscript[m, F] = 18.0009380 u; Subscript[m, O] = 15.999 u; \[EmptyUpTriangle]m = Subscript[m, F] - Subscript[m, O]; \[EmptyUpTriangle]mc^2 = 1872.65710876; Subscript[m, SuperPlus[e]] c^2 = 0.510998928; ...