Question

find a number which when multiplied by 8 and then reduced by 9 is equal to 47

Answer 1

let the number is x .
A/Q,
=> (x × 8 ) - 9 = 47
=> 8x = 47+9 =56
=> x = 56/8 = 7

Answer 2

Let a be x then
$8x - 9 = 47 \\8x = 47 + 9 \\ 8x = 56 \\ x = 56 \div 8 \\ x = 7$