Question

If thrice a certain number is diminished by 7 , the result is 9 more than number . find the number

Answer 1

let number be x
thrice=3x
diminished by 7= 3x-7
3x-7 = x+9
3x-x = 9+7
2x=16
x= 16/2
x=8 is answer

Answer 2

3x-7=x+9

3n-n=7+9

2x=16

x=16/2

x=8