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
