X+(25+33)=71 ; (74+18)-x=37
X+68=71 x=71-68 x=3 92-x=37 x= 92-37 x= 65
Х+(25+33)=71 х+58=71 х=71-58 х=13 13+(25+33)=71 71=71 (74+18)-х=37 92-х=37 х=92-37 х=55 (74+18)-55=37 37=37