как решить 1400:(35-y)-29=41

1400:(35-y)-29=41; 1400:(35-у)=41+29; 1400:(35-у)=70; 35-у=1400:70; -у=20-35; У=15

1400:(35-y)-29=411400:(35-y)=41+291400:(35-y)=7035-у=1400:7035-у=20-у=20-35-у=-15у=15ответ 15проверка1400:(35-15)-29=411400:20-29=4170-29=4141=41