Question

12+{12+[12-(12÷x+5)÷3]÷5}÷7=14

Answer 1

12+{12+[12-(12÷x+5)÷3]÷5}÷7=14

{12+[12-(12÷x+5)÷3]÷5}÷7=14-12

{12+[12-(12÷x+5)÷3]÷5}÷7=2  |·7

12+[12-(12÷x+5)÷3]÷5=2·7

[12-(12÷x+5)÷3]÷5=14-12   |·5

12-(12÷x+5)÷3=2·5

12-(12÷x+5)÷3=10  |·3

36-(12÷x+5)=30

36-12÷x-5=30   |·x

36x-12-5x =30x

31x -12 = 30x

31x-30x =12

x = 12