92-47=92-50=42+3=45
55-28=55-30=25+2=27
60-41=60-40=20-1=19
70-18+36=70-20+36=50+36=86+2=88
91-45-46=90-45=45+1=46-46=0
14+81-55=15+80-55=95-55=40
100-(72+18)+10=100-(70+20)+10=100-90+10=20
81+(50-31)-23=80+(50-30)=100-20=80-3=77
24+(65-47)+57=25+(65-50)=40+2=42+60=102-3=99