10 x (150-3) = (10x150) (_x3)

I'm not sure if it's 10x or 10 times a number

10 x (150-3) actually equals 1470

So we have to make (10 x 150) (_ x 3) = 1470

let's call the blank "a"

Now let's solve

(10 x 150) (a x 3) = 1470

10 times 150 equals 1500

1500 x (a x 3) = 1470

3 times a equals 3a because thats the correct way to write it.

1500 x 3a = 1470

-1500 - 1500

Now subtract 1500 on both sides of the equal sign

3a = - 30

3a : 3 = - 30 : 3

1a = - 10

Lastly divide 3 on both sides of the equal sign.

a = - 10