Let the unknown number be x:
x-4 = 2x
-4 = 2x-x
-4 = x
So the number is -4
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2x - 4 = 6x -4 = 4x x = -1
9+4x=2x-1 2x=-10 x=-5
sum - means addition less - means subtraction twice - means multiply by 2
2 x 20 = 40
Call your number some variable, for example, "n". Twice the number would be 2n, adding four to that you get 2n + 4, and six times all that is 6(2n + 4), which is the same as 12n + 24.