If you subtract 50 from 17 times of a certain number and divide it by 20, you can get 10 from the quotient of 4. What's the number?

If you subtract 50 from 17 times of a certain number and divide it by 20, you can get 10 from the quotient of 4. What's the number?

{(17X-50)/20}+4=10
(17X-50)/20=6
17X-50=120
17X=170
X=10
So the number is 10

What is the product of the quotient of 625 divided by 5 and the difference of 17 minus 9

（625/5）*（17-9）
=125*8
=1000

-(1 / 9) + (- 2 / 3) - (- 1 / 3) - (+ 3 / 4)

-1/9+(-2/3)-(-1/3)-(+3/4)
=-1/9-2/3+1/3-3/4
=-1/9-1/3-3/4
=-(1/9+1/3+3/4)
=-43/36.
Remove the brackets and follow the rule that negative leads to positive and positive leads to negative