Question

540:(y+12)-9=18 уровнение

Answer 1

540:(у+12)-9=18
540:(у+12)=18+9
540:(у+12)=27
у+12=540:27
у+12=20
у=20-12
у=8
проверка
540:(8+12)-9=18
540:20-9=18
27-9=18
18=18

Answer 2

540:(у+12)-9=18
540:(у+12)=18+9
540:(у+12)=27
у+12=540:27
у+12=20
у=20-12
у=8

Answer 3

540:(y+12)-9=18

540:(y+12)=18+9

540:(y+12)=27

y+12=540:27

y+12=20

y=20-12

y=8

540:(8+12)-9=18

18=18