Решите уравнение. 1)х+18=7;2)-56-х=-29 ДАЮ 30 БАЛЛОВ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!! НАДО ЗАВТРА!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1)x+18=7 x=7-18 x=-11 -11+18=7 Ответ:x=-11 2)-56-x=-29 x=-56+29 x=-27 -56-(-27)=-29 Ответ:x=-27