17,9-y=34,2-22
17,9-y=12,2
y=17,9-12,2
y=5,7
34.2-(17.9-у)=22
17.9-у=34.2-22
17.9-у=12.2
у=17.9-12.2
у=5.7
проверка
34.2-(17.9-5.7)=22
17,9-y=34,2-22
17,9-y=12,2
y=17,9-12,2
y=5,7
34.2-(17.9-у)=22
17.9-у=34.2-22
17.9-у=12.2
у=17.9-12.2
у=5.7
проверка
34.2-(17.9-5.7)=22