Реши уравнение (640:у).9 -27 =45

(640:y)*9=45+27 (640:y)*9=72 640:y=72:9 640:y=8 y=640:8 y=80

(640:y)*9-27=45 (640:y)*9=45+27 (640:y)*9=72 640:y=72:9 640:y=8 y=640:8 y=80 _______________ (640:y)*9-27=45