AgNO3 (р-ция 1) to AgNO3(P-tion 1)
(р-ция 1) Russian abbreviation (реакция 1) which means (reaction 1). Another form р-ции = reactions (plural)
P-tion 1 should be R-tion - such error often happens with Google translations.
By the way - the answer is Na2SO3.
No problems for 2019