Answer= x = 20
Step-by-step explanation: 7 is added to it => x+7
sum is multiplied by 5
=> 5(x+7)
product is divided by 9
=> 5(x+7)/9
3 is subtracted from the quotient
=> 5(x+7)/9 - 3
the remainder left is 12
=> 5(x+7)/9 - 3 = 12
add 3 on both sides
=> 5(x+7)/9 = 15
multiply by 9 on both sides
=> 5(x+7) = 15 *9
=> 5(x+7) = 13
divide by 5 on both sides
=> (x+7) = 27
subtract 7 on both sides
x = 20
