Question

F 9 is added to twice a number and this sum is multiplied by 4​, the result is the same as if the number is multiplied by 4 and 12 is added to the product. what is the​ number? the number is negative 6.

Answer 1

let
x---------> the number

we know that
[9+2x]*4=4x+12
36+8x=4x+12
8x-4x=12-36
4x=-24
x=-24/4
x=-6

the answer is
-6